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Iron Ore

Iron ore

Iron ores are minerals from which metallic iron can be extracted. The iron itself is usually found in the form of magnetite (Fe3O4) or hematite (Fe2O3), both of which are iron oxides. However, as much of the pure magnetite and hematite ore has already been mined, modern iron mines rely on aggregate ores such as taconite, which must be processed to remove non-iron-bearing components prior to smelting. Iron mines therefore produce tremendous amounts of waste. In the Minnesota mines most of the waste material known as tailings is stored in large holding basins. These large tailings basins may cause environmental problems. Iron ore is common worldwide, but commercial mining operations are dominated by nine countries: Australia, Brazil, Canada, China, India, Russia, Ukraine, South Africa and the United States. World production averages one billion metric tons of raw ore annually. The world's largest producer of iron ore is the Brazilian mining corporation CVRD. Most iron ore is used in the production of steel. Category:Economic geology ja:鉄鉱石

Iron

Iron is a chemical element with the symbol Fe (L.: Ferrum) and atomic number 26. Iron is a group 8 and period 4 metal. Iron is notable for being the final element produced by stellar nucleosynthesis, and thus the heaviest element which does not require a supernova or similarly cataclysmic event for its formation. It is therefore the most abundant heavy metal in the universe.

Notable characteristics

Iron is the most abundant metal on Earth, and is believed to be the tenth most abundant element in the universe. Iron is also the most abundant (by mass, 34.6%) element making up the Earth; the concentration of iron in the various layers of the Earth ranges from high at the inner core to about 5% in the outer crust; it is possible the Earth's inner core consists of a single iron crystal although it is more likely to be a mixture of iron and nickel; the large amount of iron in the Earth is thought to contribute to its magnetic field. Iron is a metal extracted from iron ore, and is hardly ever found in the free (elemental) state. In order to obtain elemental iron, the impurities must be removed by chemical reduction. Iron is used in the production of steel, which is not an element but an alloy, a solution of different metals (and some non-metals, particularly carbon). Nuclei of iron have some of the highest binding energies per nucleon, superseded only by the nickel isotope 62Ni. The universally most abundant of the highly stable nucleides is, however, 56Fe. This is formed by nuclear fusion in the stars. Although a further tiny energy gain could be extracted by synthesizing 62Ni, conditions in stars are not right for this process to be favoured. When a very large star contracts at the end of its life, internal pressure and temperature rise, allowing the star to produce progressively heavier elements, despite these being less stable than the elements around mass number 60 (the "iron group"). This leads to a supernova. Some cosmological models with an open universe predict that there will be a phase where as a result of slow fusion and fission reactions, everything will become iron.

Applications

Iron is the most used of all the metals, comprising 95 percent of all the metal tonnage produced worldwide. Its combination of low cost and high strength make it indispensable, especially in applications like automobiles, the hulls of large ships, and structural components for buildings. Steel is the best known alloy of iron, and some of the forms that iron takes include:
- Pig iron has 4% – 5% carbon and contains varying amounts of contaminants such as sulfur, silicon and phosphorus. Its only significance is that of an intermediate step on the way from iron ore to cast iron and steel.
- Cast iron contains 2% – 4.0% carbon , 1% – 6% silicon , and small amounts of manganese. Contaminants present in pig iron that negatively affect the material properties, such as sulfur and phosphorus, have been reduced to an acceptable level. It has a melting point in the range of 1420–1470 K, which is lower than either of its two main components, and makes it the first product to be melted when carbon and iron are heated together. Its mechanical properties vary greatly, dependant upon the form carbon takes in the alloy. 'White' cast irons contain their carbon in the form of cementite, or iron carbide. This hard, brittle compound dominates the mechanical properties of white cast irons, rendering them hard, but unresistant to shock. The broken surface of a white cast iron is full of fine facets of the broken carbide, a very pale, silvery, shiny material, hence the appellation. In 'grey' cast iron, the carbon exists free as fine flakes of graphite , and also, renders the material brittle due to the stress-raising nature of the sharp edged flakes of graphite. A newer variant of grey iron, referred to as 'ductile iron' is specially treated with trace amounts of magnesium to alter the shape of graphite to sheroids, or nodules, vastly increasing the toughness and strength of the material.
- Carbon steel contains between 0.5% and 1.5% carbon, with small amounts of manganese, sulfur, phosphorus, and silicon.
- Wrought iron contains less than 0.2% carbon. It is a tough, malleable product, not as fusible as pig iron. It has a very small amount of carbon, a few tenths of a percent. If honed to an edge, it loses it quickly. Wrought iron is characterised, especially in old samples, by the presence of fine 'stringers' or filaments of slag entrapped in the metal.
- Alloy steels contain varying amounts of carbon as well as other metals, such as chromium, vanadium, molybdenum, nickel, tungsten, etc. They are used for structural purposes, as their alloy content raises their cost and necessitates justification of their use. Recent developments in ferrous metallurgy have produced a growing range of microalloyed steels, also termed 'HSLA' or high-strength, low alloy steels, containing tiny additions to produce high strengths and often spectacular toughness at minimal cost.
- Iron(III) oxides are used in the production of magnetic storage in computers. They are often mixed with other compounds, and retain their magnetic properties in solution.

History

The first signs of use of iron come from the Sumerians and the Egyptians, where around 4000 BC, a few items, such as the tips of spears, daggers and ornaments, were being fashioned from iron recovered from meteorites. Because meteorites fall from the sky some linguists have conjectured that the English word iron (OE īsern), which has cognates in many northern and western European languages, derives from the Etruscan aisar which means "the gods". By 3000 BC to 2000 BC, increasing numbers of smelted iron objects (distinguishable from meteoric iron by the lack of nickel in the product) appear in Mesopotamia, Anatolia, and Egypt. However, their use appears to be ceremonial, and iron was an expensive metal, more expensive than gold. In the Iliad, weaponry is mostly bronze, but iron ingots are used for trade. Some resources (see the reference What Caused the Iron Age? below) suggest that iron was being created then as a by-product of copper refining, as sponge iron, and was not reproducible by the metallurgy of the time. By 1600 BC to 1200 BC, iron was used increasingly in the Middle East, but did not supplant the dominant use of bronze. bronze In the period from the 12th to 10th century BC, there was a rapid transition in the Middle East from bronze to iron tools and weapons. The critical factor in this transition does not appear to be the sudden onset of a superior ironworking technology, but instead the disruption of the supply of tin. This period of transition, which occurred at different times in different parts of the world, is the ushering in of an age of civilization called the Iron Age. Concurrent with the transition from bronze to iron was the discovery of carburization, which was the process of adding carbon to the irons of the time. Iron was recovered as sponge iron, a mix of iron and slag with some carbon and/or carbide, which was then repeatedly hammered and folded over to free the mass of slag and oxidise out carbon content, so creating the product wrought iron. Wrought iron was very low in carbon content and was not easily hardened by quenching. The people of the Middle East found that a much harder product could be created by the long term heating of a wrought iron object in a bed of charcoal, which was then quenched in water or oil. The resulting product, which had a surface of steel, was harder and less brittle than the bronze it began to replace. In China the first irons used were also meteoric iron, with archeological evidence for items made of wrought iron appearing in the northwest, near Xinjiang, in the 8th century BC. These items were made of wrought iron, created by the same processes used in the Middle East and Europe, and were thought to be imported by non-Chinese people. In the later years of the Zhou Dynasty (ca 550 BC), a new iron manufacturing capability began because of a highly developed kiln technology. Producing blast furnaces capable of temperatures exceeding 1300 K, the Chinese developed the manufacture of cast, or pig iron. Iron was used in India as early as 250 BCE. The famous iron pillar in the Qutb complex in Delhi is made of very pure iron (98%) and has not rusted or eroded till this day. Delhi of wood annually from 1827 to 1891.]] If iron ores are heated with carbon to 1420–1470 K, a molten liquid is formed, an alloy of about 96.5% iron and 3.5% carbon. This product is strong, can be cast into intricate shapes, but is too brittle to be worked, unless the product is decarburized to remove most of the carbon. The vast majority of Chinese iron manufacture, from the Zhou dynasty onward, was of cast iron. Iron, however, remained a pedestrian product, used by farmers for hundreds of years, and did not really affect the nobility of China until the Qin dynasty (ca 221 BC). Cast iron development lagged in Europe, as the smelters could only achieve temperatures of about 1000 K. Through a good portion of the Middle Ages, in Western Europe, iron was still being made by the working of sponge iron into wrought iron. Some of the earliest casting of iron in Europe occurred in Sweden, in two sites, Lapphyttan and Vinarhyttan, between 1150 and 1350 AD. There are suggestions by scholars that the practice may have followed the Mongols across Russia to these sites, but there is no clear proof of this hypothesis. In any event, by the late fourteenth century, a market for cast iron goods began to form, as a demand developed for cast iron cannonballs. Early iron smelting (as the process is called) used charcoal as both the heat source and the reducing agent. In 18th century England, wood supplies ran down and coke, a fossil fuel, was used as an alternative. This innovation by Abraham Darby supplied the energy for the Industrial Revolution.

Occurrence

Industrial Revolution Iron is one of the more common elements on Earth, making up about 5% of the Earth's crust. Most of this iron is found in various iron oxides, such as the minerals hematite, magnetite, and taconite. The earth's core is believed to consist largely of a metallic iron-nickel alloy. About 5% of the meteorites similarly consist of iron-nickel alloy. Although rare, these are the major form of natural metallic iron on the earth's surface. Iron is also one of the least reactive metals, and therefore, it is sometimes found pure in nature.

Extraction from ore

Industrially, iron is extracted from its ores, principally hematite (nominally Fe2O3) and magnetite (Fe3O4) by a carbothermic reaction (reduction with carbon) in a blast furnace at temperatures of about 2000°C. In a blast furnace, iron ore, carbon in the form of coke, and a flux such as limestone are fed into the top of the furnace, while a blast of heated air is forced into the furnace at the bottom. In the furnace, the coke reacts with oxygen in the air blast to produce carbon monoxide: :6 C + 3 O2 → 6 CO The carbon monoxide reduces the iron ore (in the chemical equation below, hematite) to molten iron, becoming carbon dioxide in the process: :6 CO + 2 Fe2O3 → 4 Fe + 6 CO2 The flux is present to melt impurities in the ore, principally silicon dioxide sand and other silicates. Common fluxes include limestone (principally calcium carbonate) and dolomite (magnesium carbonate). Other fluxes may be used depending on the impurities that need to be removed from the ore. In the heat of the furnace the limestone flux decomposes to calcium oxide (quicklime): :CaCO3 → CaO + CO2 Then calcium oxide combines then with silicon dioxide to form a slag. :CaO + SiO2 → CaSiO3 The slag melts in the heat of the furnace, which silicon dioxide would not have. In the bottom of the furnace, the molten slag floats on top of the more dense liquid iron, and spouts in the side of the furnace may be opened to drain off either the iron or the slag. The iron, once cooled, is called pig iron, while the slag can be used as a material in road construction or to improve mineral-poor soils for agriculture. Approximately 1100Mt (million tons) of iron ore was produced in the world in 2000, with a gross market value of approximately 25 billion US dollars. While ore production occurs in 48 countries, the five largest producers were China, Brazil, Australia, Russia and India, accounting for 70% of world iron ore production. The 1100Mt of iron ore was used to produce approximately 572Mt of pig iron.

Compounds

2000 production.]] Common oxidation states of iron include:
- the Iron(-II) state, Fe2- (e.g. Fe(CO)42-,Fe(CO)2(NO)2.
- the Iron(0) state, Fe(CO)5, Fe(PF3)5.
- the Iron(I) state, [Fe(H2O)5NO]2+.
- the Iron(II) state, Fe2+, previously ferrous is very common.
- the Iron(III) state, Fe3+, previously ferric, is also very common, for example in rust.
- the Iron(IV) state, Fe4+, previously ferryl, stabilized in some enzymes (e.g. peroxidases).
- the Iron(VI) state, Fe6+ is also known, if rare, in potassium ferrate. Iron carbide Fe3C is known as cementite.

Biological role

Iron is essential to all organisms, except for a few bacteria. It is mostly stably incorporated in the inside of metalloproteins, because in exposed or in free form it causes production of free radicals that are generally toxic to cells. To say that iron is free doesn't mean that it is free floating in the bodily fluids. Iron binds avidly to virtually all biomolecules so it will adhere nonspecifically to cell membranes, nucleic acids, proteins etc. Many animals incorporate iron into the heme complex, an essential component of cytochromes, which are proteins involved in redox reactions (including but not limited to cellular respiration), and of oxygen carrying proteins hemoglobin and myoglobin. Inorganic iron involved in redox reactions is also found in the iron-sulfur clusters of many enzymes, such as nitrogenase (involved in the synthesis of ammonia from nitrogen and hydrogen) and hydrogenase. A class of non-heme iron proteins is responsible for a wide range of functions within several life forms, such as enzymes methane monooxygenase (oxidizes methane to methanol), ribonucleotide reductase (reduces ribose to deoxyribose; DNA biosynthesis), hemerythrins (oxygen transport and fixation in marine invertebrates) and purple acid phosphatase (hydrolysis of phosphate esters). When the body is fighting a bacterial infection, the body sequesters iron inside of cells (mostly stored in the storage molecule ferritin so that it cannot be used by bacteria. Iron distribution is heavily regulated in mammals, both as a defense against bacterial infection as well as the potential biological toxicity of iron. The iron absorbed from the duodenum binds to transferrin, and is carried by blood to different cells. There it gets by an as yet unknown mechanism incorporated into target proteins. [http://www.plosbiology.org/plosonline/?request=get-document&doi=10.1371%2Fjournal.pbio.0000079]. A lengthier article on the system of human iron regulation can be found in the article on human iron metabolism. Good sources of dietary iron include meat, fish, poultry, lentils, beans, leaf vegetables, tofu, chickpeas, black-eyed pea, strawberries and farina. Iron provided by dietary supplements is often found as Iron (II) fumarate. The RDA for iron varies considerably based on the age, gender, and source of dietary iron (heme-based iron has higher bioavailability)[http://www.iom.edu/Object.File/Master/7/294/0.pdf]. Also note the section below on precautions.

Isotopes

Naturally occurring iron consists of four isotopes: 5.845% of radioactive 54Fe (half-life: >3.1E22 years), 91.754% of stable 56Fe, 2.119% of stable 57Fe and 0.282% of stable 58Fe. 60Fe is an extinct radionuclide of long half-life (1.5 million years). Much of the past work on measuring the isotopic composition of Fe has centered on determining 60Fe variations due to processes accompanying nucleosynthesis (i.e., meteorite studies) and ore formation. The isotope 56Fe is of particular interest to nuclear scientists. A common misconception is that this isotope represents the most stable nucleus possible, and that it thus would be impossible to perform fission or fusion on 56Fe and still liberate energy. This is not true, as both 62Ni and 58Fe are more stable. In phases of the meteorites Semarkona and Chervony Kut a correlation between the concentration of 60Ni, the daughter product of 60Fe, and the abundance of the stable iron isotopes could be found which is evidence for the existence of 60Fe at time formation of solar system. Possibly the energy released by the decay of 60Fe contributed, together with the energy released by decay of the radionuclide 26Al, to the remelting and differentiation of asteroids after their formation 4.6 billion years ago. The abundance of 60Ni present in extraterrestrial material may also provide further insight into the origin of the solar system and its early history. Of the stable isotopes, only 57Fe has a nuclear spin (−1/2). For this reason, 57Fe has application as a spin isotope in chemistry and biochemistry.

Precautions

Excessive dietary iron is toxic, because excess ferrous iron reacts with peroxides in the body, producing free radicals. When iron is in normal quantity, the body's own antioxidant mechanisms can control this process. In excess, uncontrollable quantities of free radicals are produced. The lethal dose of iron in a two-year-old is about three grams of iron. One gram can induce severe poisoning. There are reported cases of children being poisoned by consuming between 10 and 50 tablets of ferrous sulfate over a period of several hours. Over-consumption of iron is the single highest cause of death in children by unintentional ingestion of pharmaceuticals. The DRI lists the Tolerable Upper Intake Level (UL) for adults as 45 mg/day. For children under fourteen years old the UL is 40 mg/day. If iron intake is excessive a number of iron overload disorders can result, such as hemochromatosis. For this reason, people should not take iron supplements unless they suffer from iron deficiency and have consulted a doctor. Blood donors are at special risk of low iron levels and are often recommended to supplement their iron intake. A specific chelating agent called Desferrioxime is used to expell excess iron from the body in case of iron toxicity.

References


- [http://periodic.lanl.gov/elements/26.html Los Alamos National Laboratory — Iron]

External links


- [http://www.webelements.com/webelements/elements/text/Fe/index.html WebElements.com – Iron]
- [http://education.jlab.org/itselemental/ele026.html It's Elemental – Iron]
- [http://hyperphysics.phy-astr.gsu.edu/hbase/nucene/nucbin2.html The Most Tightly Bound Nuclei] Category:Chemical elements Category:Transition metals ko:철 ms:Besi ja:鉄 simple:Iron th:เหล็ก

Hematite

Hematite (AE) or haematite (BE) is the mineral form of Iron (III) oxide, (Fe2O3), one of several iron oxides. The ore sometimes contains slight amounts of titanium. When shaped into ornaments, it is often called black diamond. titanium Hematite is a very common mineral, coloured black to steel or silver-gray, brown to reddish brown, or red. It is mined as the main ore of iron. Varieties include Bloodstone, Iron Rose, Kidney Ore, Martite, Paint Ore, Specularite (Specular Hematite), Rainbow Hematite and Titano-hematite. While the forms of hematite vary, they all have a rust-red streak. Deposits of grey hematite are typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone. The mineral can precipitate out of water and collect in layers at the bottom of a lake, spring, or other standing water. But hematite can also occur without water, as the result of volcanic activity. Clay-sized hematite crystals can also occur as a secondary mineral formed by weathering processes in soil, and along with other iron oxides or oxyhydroxides such as goethite, is responsible for the red color of many tropical, ancient, or otherwise highly weathered soils. The name hematite is derived from the Greek word for blood, since sometimes hematite can be red, as in Rouge, a powderized form of hematite. It shares this root with the word hemoglobin. Hemoglobin is the oxygen-transporting molecule in red blood cells, the iron of which causes blood to be red. The color of hematite lends it well in use as a pigment. Especially nice specimens of hematite come from England, Mexico, Brazil, Australia and the Lake Superior region of the United States and Canada. Hematite is an antiferromagnetic material [http://www.earthsci.unimelb.edu.au/ES304/MODULES/MAG/NOTES/typesmag.html].

Hematite on Mars

Hematite can be formed by aqueous processes, weathering processes, or without water. In 2004, NASA's Mars rover Opportunity discovered small spheres believed to be made partly or mostly of hematite. The spheres are only a few millimeters in diameter and are believed to have formed as rock deposites under watery conditions billions of years ago when Mars was a wetter world. The rover used its instruments to test how the hematite found on Mars at Meridiani Planum was formed.

See also


- Iron ore
- Iron oxide
- List of minerals

External links


- [http://marsrovers.jpl.nasa.gov/gallery/press/opportunity/20040212a/07-ml-3-soil-mosaic-B019R1_br.jpg Mars spheres image].
- [http://marsrovers.jpl.nasa.gov/gallery/press/opportunity/20040219a/08-AY-3-shiny-B026R1_br.jpg Mars trench image showing a shiny texture of half-buried spheres] (dark line is equipment shadow) Category:Oxide minerals Category:Iron minerals ja:赤鉄鉱

Oxides

An oxide is a chemical compound of oxygen with other chemical elements. In the 18th century, oxides were named calxes or calces after the calcination process used to produce oxides. Calx was later replaced by oxyd. See :Category:Oxides for a list of oxides.

Current naming

Oxides can be named after the amount of oxygen atoms in the oxide. Oxides containing only one oxygen are called oxide or monoxide, those containing two oxygen atoms dioxide, three trioxide, four tetroxide, and so on following the Greek numerical prefixes. There are two other types of oxide—peroxide and superoxide. Both count as oxides but have different oxidation states and react in different ways compared to oxides.

Chemical properties

Oxides are formed in redox reactions through oxidation in which a reducing agent is allowed to react with molecular oxygen (O2) or oxidizing agents which contain oxygen, such as hydrogen peroxide (H2O2) and permanganate (MnO4-). Oxides are characterized by a redistribution of electrons, in which the oxygen atoms have a net surplus of electrons and the other atoms a net lack. In oxides of hydrogen, carbon, nitrogen, sulfur, phosphorus and halogens, covalent bonds occur between oxygen and the other elements. Generally, these are gases or fluids at room temperature. Oxides of metals occur as ionic compounds, or salts, which are solid at room temperature. Oxide salts are generally insoluble in water, though some react with it. Generally, oxides are not conductive to electricity. This property is most commonly taken advantage of with silicon dioxide, as silicon can easily be oxidized and the resulting part can be made into a transistor. This is the basis for much of modern computer technology.

Types of oxides

Oxides of more electropositive elements tend to be basic. They are called basic anhydrides; adding water, they may form basic hydroxides. For example, sodium oxide is basic; when hydrated, it forms sodium hydroxide. Oxides of more electronegative elements tend to be acids. They are called acid anhydrides; adding water, they may form oxygen acids. For example, dichlorine heptoxide is acid; perchloric acid is a more hydrated form. Some oxides can act as both acid and base, at different times. They are amphoteric. An example is aluminium oxide. Some oxides do not show behavior as either acid or base. The oxides of the chemical elements in their highest oxidation state are predictable and the chemical formula can be derived from the number of valence electrons for that element. Even the chemical formula of ozone is predictable as a group 16 element. One exception is copper for which the highest oxidation state oxide is copper(II) oxide and not copper(I) oxide. Another exception is fluoride that does not exist as expected as F2O7 but as OF2 with the least electronegative element given priority. . Phosphorus pentoxide, the third exception is not properly represented by the chemical formula P2O5 but by P4O10

Common oxides sorted by oxidation state


- Covalent oxides
  - Water (H2O)
  - Carbon dioxide (CO2)
  - Nitrogen oxides (NOX)
  - Sulfur dioxide (SO2)
- Element in (I) state
  - Sodium oxide (Na2O)
  - Potassium oxide (K2O)
  - Copper(I) oxide (Cu2O)
  - Dichlorine monoxide (Cl2O)
  - Nitrous oxide (N2O)
- Element in (II) state
  - Beryllium oxide (BeO)
  - Calcium oxide (CaO)
  - Carbon monoxide (CO)
  - Copper(II) oxide (CuO)
  - Iron(II) oxide (FeO)
  - Lead(II) oxide (PbO)
  - Magnesium oxide (MgO)
  - Mercury oxide (O)
  - Nitrogen oxide (NO)
  - Zinc oxide (ZnO)
- Element in (III) state
  - Aluminium oxide (Al2O3)
  - Antimony trioxide (Sb2O3)
  - Arsenic trioxide (As2O3)
  - Boron oxide (B2O3)
  - Dinitrogen trioxide (N2O3)
  - Iron(III) oxide (Fe2O3)
  - Yttrium(III) oxide (Y2O3)
- Element in (IV) state
  - Carbon dioxide (CO2)
  - Cerium(IV) oxide (CeO2)
  - Chlorine dioxide (ClO2)
  - Manganese dioxide (MnO2)
  - Nitrogen dioxide (NO2)
  - Ozone (O3)
  - Silicon dioxide (SiO2)
  - Sulfur dioxide (SO2)
  - Tellurium dioxide (TeO2)
  - Thorium dioxide (O2)
  - Titanium dioxide (TiO2)
  - Zirconia (ZrO2)
- Element in (V) state
  - Dinitrogen pentoxide (N2O5)
  - Phosphorus pentoxide (P2O5)
- Element in (VI) state
  - Molybdenum trioxide (MoO3)
  - Sulfur trioxide (SO3)
- Element in (VII) state
  - Dichlorine heptoxide (Cl2O7)
- Element in (VIII) state
  - Osmium tetroxide (OsO4)

See also


- Other oxygen ions ozonide, O3-, superoxide, O2-, peroxide, O22- and dioxygenyl, O2+.

References

# Fully Exploiting the Potential of the Periodic Table through Pattern Recognition Schultz, Emeric. J. Chem. Educ. 2005 82 1649.
- ja:酸化物

Ore

)]] An ore is a mineral deposit containing a metal or other valuable resource in economically viable concentrations. Usually, it is used in the context of a mineral deposit from which it is economical to extract its metallic component. Ores are mined. Ore minerals are generally oxides, sulfides, silicates, or native metals that are not commonly concentrated in the Earth's crust. The ores must be processed to extract the metals of interest from the waste rock and from the ore minerals. Ore bodies are formed by a variety of geological processes. The abundance of an ore will directly affect the costs associated with mining the ore and the subsequent cost of the metal extracted.

Important ore minerals


- Argentite: Ag2S
- Barite: BaSO4
- Beryl: Be3Al2(SiO3)6
- Bornite: Cu5FeS4
- Cassiterite: SnO2
- Chalcocite: Cu2S
- Chalcopyrite: CuFeS2
- Chromite: (Fe,Mg)Cr2O4
- Cinnabar: HgS
- Cobaltite: (Co,Fe)AsS
- Columbite-Tantalite or Coltan: (Fe,Mn)(Nb,Ta)2O6
- Galena: PbS
- Gold: Au
- Hematite: Fe2O3
- Ilmenite: FeTiO3
- Magnetite: Fe3O4
- Molybdenite: MoS2
- Pentlandite:(Fe,Ni)9S8
- Scheelite: CaWO4
- Sphalerite: ZnS
- Uraninite: UO2
- Wolframite: (Fe,Mn)WO4 Category:Economic geology

Taconite

Taconite is an iron-bearing, high-silica, flint-like rock. It is a Precambrian sedimentary rock referred to as a banded iron formation due to the typical alternating iron-rich layers and shale or chert layers. The very finely dispersed iron content, present as magnetite, is generally 25 to 30%. In the late 19th and early 20th centuries, iron ore was of such high quality that taconite was considered an uneconomic waste product. After World War II, most of the high grade ore in the United States had been mined out, and so taconite was turned to as a new source of iron. To process taconite, the ore is ground into a fine powder, the iron is separated from the waste rock by using strong magnets, and then the powdered iron concentrate is combined with bentonite clay and limestone as a flux and rolled into pellets about one centimeter in diameter. The pellets are heated to very high temperatures to oxidize the magnetite (Fe3O4) to hematite (Fe2O3) for further processing. The Mesabi Iron Range region of the American state of Minnesota is a major production area. The taconite iron concentrate is shipped by railroad through Two Harbors and the Twin Ports of Duluth, Minnesota and Superior, Wisconsin, both on Lake Superior. The ore is generally shipped to other locations on the Great Lakes. Many steelmaking centers are located near Lake Erie. From about 1900 through 1992, great machines called Hulett ore unloaders performed the task. Self-unloading ships later made the Huletts obsolete.

References


- [http://www.dnr.state.mn.us/education/geology/digging/taconite.html Minnesota DNR]
- [http://www.tc.umn.edu/~smith213/ma.htm Magnetite in taconite]
- [http://geography.miningco.com/library/misc/ucmesabi.htm Mesabi Iron Ore Range] Category:Economic geology Category:Mining Category:Iron minerals

Smelting

:See smelt for the style of fishing with dip nets in tributaries of the Great Lakes during the spring spawning run of that small fish. Chemical reduction, or smelting, is a form of extractive metallurgy. The main use of smelting is to produce iron and steel from iron ore. Smelting is also used to extract copper and other base metals from their raw ores. It makes use of a chemical reducing agent such as carbon (coke, or in earlier times charcoal) to change the oxidation state of the metal ore. When coke is mixed with iron ore and heated, the oxygen will move from the iron to the carbon. The iron will be reduced, and the carbon will be oxidised, producing carbon dioxide and carbon monoxide. A fluxing agent such as limestone is used to remove the accompanying rock gangue as slag (also called scoria or cinder). In Ancient Egypt somewhere between the Third Intermediate Period and 23rd Dynasty (1100 BC - 750 BC) there are indications of iron working. There are further indications of iron smelting and working in West Africa in 500 BC [http://www.louisville.edu/a-s/history/herlin/textsup.htm]. The process of smelting became widely used during the Industrial Revolution, when it was used extensively in the production of iron and steel.

See also


- Blast furnace
- Furnace
- Metallurgy
- Pyrometallurgy
- Iron Age Category:Metallurgy Category:Metals processes ja:製錬

Waste

:For other uses of the word, see Waste (disambiguation). Waste (disambiguation)] Waste is unwanted or undesired material. Waste can exist in any phase of matter (solid, liquid, or gas). When released in the latter two states, gas especially, the wastes are referred to as emissions. It is usually strongly linked with pollution.

Sources of waste

pollution Waste produced in the wild is reintegrated through natural recycling processes, such as dry leaves in a forest decomposing into soil. Outside of the wild these wastes may become problematic, such as dry leaves in an urban environment. The highest volume of waste, outside of nature, comes from human industrial activity: mining, industrial manufacturing, consumer use, and so on1. Almost all manufactured products are destined to become waste at some point in time, with a volume of waste production roughly similar to the volume of resource consumption. Post-consumer waste is the waste produced by the end-user (the rubbish one puts outside in the rubbish bin). This is the waste people usually think of. But though the most visible, this is very small compared to the waste created in the process of mining and production.

Human waste

Post-consumer waste Human waste is a term in the English language usually used to refer to byproducts of digestion, such as feces and urine. Human waste can be a serious health hazard, as it is a good vector for both viral and bacterial diseases. A major accomplishment of human civilization has been the reduction of disease transmission via human waste through the practice of hygiene and sanitation, including the development of theories of sewage systems and plumbing. Human waste can be reduced and reused through use of greywater, waterless urinals and humanure systems. In very rural places without sewage systems, small populations allow for the continued use of honey buckets and sewage lagoons without the threat of disease presented by places with more dense populations. honey bucket]

See also


- Waste management
- Nuclear waste

References

This page contains material imported from [http://develop.consumerium.org/] please see the [http://develop.consumerium.org/wiki/index.php?title=Waste&action=history history] of the [http://develop.consumerium.org/wiki/index.php/Waste original article]. The original material was licensed under the GFDL v 1.2. # [http://dataservice.eea.eu.int/atlas/viewdata/viewpub.asp?id=392 Total waste generation by sector - EEA Countries 1992-1997], European Environmental Agency, retrieved 5 January 2005.

External links


- [http://www.bbc.co.uk/dna/h2g2/A4643787 BBC - h2g2 - Waste]
- ko:쓰레기 ja:廃棄物

Australia

The Commonwealth of Australia is a country in the Southern Hemisphere comprising the world's smallest continent and a number of islands in the Southern, Indian and Pacific Oceans. Australia's neighbouring countries are Indonesia, East Timor and Papua New Guinea to the north, the Solomon Islands, Vanuatu and New Caledonia to the northeast, and New Zealand to the southeast. The continent of Australia has been inhabited for over 40,000 years by Indigenous Australians. After sporadic visits by fishermen from the north and by European explorers and merchants starting in the 17th century, the eastern half of the continent was claimed by the British in 1770 and officially settled as the penal colony of New South Wales on 26 January 1788. As the population grew and new areas were explored, another five largely self-governing Crown Colonies were successively established over the course of the 19th century. On 1 January 1901, the six colonies federated and the Commonwealth of Australia was formed. Since federation, Australia has maintained a stable liberal democratic political system and remains a Commonwealth Realm. The current population of around 20.4 million is concentrated mainly in the large coastal cities of Sydney, Melbourne, Brisbane, Perth and Adelaide.

Origin and history of the name

The name Australia is derived from the Latin australis, meaning southern. Legends of an "unknown southern land" (terra australis incognita) date back to the Roman times and were commonplace in mediæval geography, but they were not based on any actual knowledge of the continent. The Dutch adjectival form Australische ("Australian," in the sense of "southern") was used by Dutch officials in Batavia to refer to the newly discovered land to the south as early as 1638. The first English language writer to use the word "Australia" was Alexander Dalrymple in An Historical Collection of Voyages and Discoveries in the South Pacific Ocean, published in 1771. He used the term to refer to the entire South Pacific region, not specifically to the Australian continent. In 1793, George Shaw and Sir James Smith published Zoology and Botany of New Holland, in which they wrote of "the vast island, or rather continent, of Australia, Australasia or New Holland." New Holland was established on this site.]] The name "Australia" was popularised by the 1814 work A Voyage to Terra Australis by the navigator Matthew Flinders. Despite its title, which reflected the view of the Admiralty, Flinders used the word "Australia" in the book, which was widely read and gave the term general currency. Governor Lachlan Macquarie of New South Wales subsequently used the word in his dispatches to England. In 1817 he recommended that it be officially adopted. In 1824, the British Admiralty agreed that the continent should be known officially as Australia.

History

England, claiming the land for Britain in 1770. This replica was built in Fremantle in 1988 for Australia's bicentenary.]] The first human habitation of Australia is estimated to have occurred between 42,000 and 48,000 years ago. The first Australians were the ancestors of the current Indigenous Australians; they arrived via land bridges and short sea-crossings from present-day India or Southeast Asia. Most of these people were hunter-gatherers, with a complex oral culture and spiritual values based on reverence for the land and a belief in the Dreamtime. The Torres Strait Islanders, ethnically Melanesian, inhabited the Torres Strait Islands and parts of far-north Queensland; they possess distinct cultural practices and practised subsistence agriculture. The first undisputed recorded European sighting of the Australian continent was made by the Dutch navigator Willem Jansz, who sighted the coast of Cape York Peninsula in 1606. During the 17th century, the Dutch charted the whole of the western and northern coastlines of what they called New Holland, but made no attempt at settlement. In 1770, James Cook sailed along and mapped the east coast of Australia, which he named New South Wales and claimed for Britain. The expedition's discoveries provided impetus for the establishment of a penal colony there following the loss of the American colonies that had previously filled that role. penal colony was Australia's largest penal colony.]] The British Crown Colony of New South Wales started with the establishment of a settlement at Port Jackson by Captain Arthur Phillip on 26 January 1788. This date was later to become Australia's national day, Australia Day. Van Diemen's Land, now known as Tasmania, was settled in 1803 and became a separate colony in 1825. Britain formally claimed the western part of Australia in 1829. Separate colonies were created from parts of New South Wales: South Australia in 1836, Victoria in 1851, and Queensland in 1859. The Northern Territory (NT) was founded in 1863 as part of the Province of South Australia. Victoria and South Australia were founded as "free colonies"—that is, they were never penal colonies, although the former did receive some convicts from Tasmania. Western Australia was also founded "free", but later accepted transported convicts due to an acute labour shortage. The transportation of convicts to Australia was phased out between 1840 and 1868. The Indigenous Australian population, estimated at about 350,000 at the time of European settlement, declined steeply for 150 years following settlement, mainly because of infectious disease, and forced migration, the removal of children and other colonial government policies, that some historians and Indigenous Australians have argued could be considered to constitute genocide by today's understanding. Such interpretations of Aboriginal history are disputed by some as being exaggerated or fabricated for political or ideological reasons. Following the 1967 referendum, the Federal government gained the power to implement policies and make laws with respect to Aborigines. Traditional ownership of land—native title—was not recognised until the High Court case Mabo v Queensland (No 2) overturned the notion of Australia as terra nullius at the time of European occupation. terra nullius ceremony in Port Melbourne, Victoria, 25 April 2005. Ceremonies such as this are held in virtually every suburb and town in Australia.]] A gold rush began in Australia in the early 1850s, and the Eureka Stockade rebellion in 1854 was an early expression of nationalist sentiment. Between 1855 and 1890, the six colonies individually gained responsible government, managing most of their own affairs while remaining part of the British Empire. The Colonial Office in London retained control of some matters, notably foreign affairs, defence and international shipping. On 1 January 1901, federation of the colonies was achieved after a decade of planning, consultation and voting, and the Commonwealth of Australia was born, as a Dominion of the British Empire. The Australian Capital Territory (ACT) was formed from New South Wales in 1911 to provide a location for the proposed new federal capital of Canberra (Melbourne was the capital from 1901 to 1927). The Northern Territory was transferred from the control of the South Australian government to the Commonwealth in 1911. Australia willingly participated in World War I; many Australians regard the defeat of the Australian and New Zealand Army Corps (ANZACs) at Gallipoli as the birth of the nation—its first major military action. Much like Gallipoli the Kokoda Track Campaign is regarded by many as a nation defining battle from World War II. The Statute of Westminster 1931 formally ended most of the constitutional links between Australia and Britain, but Australia did not adopt the Statute until 1942. The shock of Britain's defeat in Asia in 1942 and the threat of Japanese invasion caused Australia to turn to the United States as a new ally and protector. Since 1951, Australia has been a formal military ally of the US under the auspices of the ANZUS treaty. After World War II, Australia encouraged mass immigration from Europe; since the 1970s and the abolition of the White Australia policy, immigration from Asia and other parts of the world was also encouraged. As a result, Australia's demography, culture and image of itself were radically transformed. The final constitutional ties between Australia and Britain ended in 1986 with the passing of the Australia Act 1986, ending any British role in the Australian States, and ending judicial appeals to the UK Privy Council. Although Australian voters rejected a move to become a republic in 1999 by a 55% majority, Australia's links to its British past are increasingly tenuous. Since the election of the Whitlam Government in 1972, there has been an increasing focus on the nation's future as a part of the Asia-Pacific region.

Politics

Whitlam Government was opened in 1988 replacing the provisional Parliament House building opened in 1927.]] The Commonwealth of Australia is a constitutional monarchy and has a parliamentary system of government. Queen Elizabeth II is the Queen of Australia, a role that is distinct from her position as Elizabeth II of the United Kingdom. The Queen is nominally represented by the Governor-General; although the Constitution gives extensive executive powers to the Governor-General, these are normally exercised only on the advice of the Prime Minister. The most notable exercise of the Governor-General's reserve powers outside the Prime Minister's direction was the dismissal of the Whitlam Government in the constitutional crisis of 1975. There are three branches of government.
- The legislature: the Commonwealth Parliament, comprising the Queen, the Senate (the Red house), and the House of Representatives (the Green house); the Queen is represented by the Governor-General, who in practice exercises little or no power over the Parliament.
- The executive: the Federal Executive Council (the Governor-General as advised by the executive councillors); in practice, the councillors are the prime minister and ministers of state, whose advice the Governor-General accepts, with rare exceptions.
- The judiciary: the High Court of Australia and other federal courts. The State courts became formally independent from the Judicial Committee of the Privy Council when the Australia Act was passed in 1986. The bicameral Commonwealth Parliament consists of the Queen, the Senate (the upper house) of 76 senators, and a House of Representatives (the lower house) of 150 members. Members of the lower house are elected from single-member constituencies, commonly known as 'electorates' or 'seats'. Seats in the House of Representatives are allocated to states on the basis of population. In the Senate, each state, regardless of population, is represented by 12 senators, with the ACT and the NT each electing two. Elections for both chambers are held every three years; typically only half of the Senate seats are put to each election, because senators have overlapping six-year terms. The party with majority support in the House of Representatives forms Government, with its leader becoming Prime Minister. There are three major political parties: the Labor Party, the Liberal Party and the National Party. Independent members and several minor parties—including the Greens, Family First and the Australian Democrats—have achieved representation in Australian parliaments, mostly in upper houses, although their influence has been marginal. Since the 1996 election, the Liberal/National Coalition led by the Prime Minister, John Howard, has been in power in Canberra. In the 2004 election, the Coalition won control of the Senate, the first time that a party (or coalition of governing parties) has done so while in government in more than 20 years. The Labor Party is in power in every state and territory. Voting is compulsory in each state and territory and at the federal level.

States and territories

Voting is compulsory Australia consists of six states, two major mainland territories, and other minor territories. The states are New South Wales, Queensland, South Australia, Tasmania, Victoria and Western Australia. The two major mainland territories are the Northern Territory and the Australian Capital Territory. In most respects, the territories function similarly to the states, but the Commonwealth Parliament can override any legislation of their parliaments. By contrast, federal legislation overrides state legislation only with respect to certain areas as set out in Section 51 of the Constitution; all residual legislative powers are retained by the state parliaments, including powers over hospitals, education, police, the judiciary, roads, public transport and local government. Each state and territory has its own legislature (unicameral in the case of the Northern Territory, the ACT and Queensland, and bicameral in the remaining states). The lower house is known as the Legislative Assembly (House of Assembly in South Australia and Tasmania) and the upper house the Legislative Council. The heads of the governments in each state and territory are called premiers and chief ministers, respectively. The Queen is represented in each state by a governor; an administrator in the Northern Territory, and the Governor-General in the ACT, have analogous roles. Australia also has several minor territories; the federal government administers a separate area within New South Wales, the Jervis Bay Territory, as a naval base and sea port for the national capital. In addition Australia has the following, inhabited, external territories: Norfolk Island, Christmas Island, Cocos (Keeling) Islands, and several largely uninhabited external territories: Ashmore and Cartier Islands, Coral Sea Islands, Heard Island and McDonald Islands and the Australian Antarctic Territory.

Foreign relations and military

Over recent decades, Australia's foreign relations have been driven by a close association with the United States, through the ANZUS pact and by a desire to develop relationships with Asia and the Pacific, particularly through ASEAN and the Pacific Islands Forum. In 2005 Australia secured an inaugural seat at the East Asia Summit following its accession to the Treaty of Amity and Cooperation. Australia is a member of the Commonwealth of Nations, in which the Commonwealth Heads of Government meetings provide the main forum for co-operation. Much of Australia's diplomatic energy is focused on international trade liberalisation. Australia led the formation of the Cairns Group and APEC, and is a member of the OECD and the WTO. Australia has pursued several major bilateral free trade agreements, most recently the US–Australia Free Trade Agreement. Australia is a founding member of the United Nations, and maintains an international aid program under which some 60 countries receive assistance. The 2005–06 budget provides A$2.5bn for development assistance; as a percentage of GDP, this contribution is less than that of the UN Millennium Development Goals. Australia's armed forces—the Australian Defence Force (ADF)—comprise the Royal Australian Navy (RAN), the Australian Army, and the Royal Australian Air Force (RAAF). All branches of the ADF have been involved in UN and regional peacekeeping (most recently in East Timor, the Solomon Islands and Sudan), disaster relief, and armed conflict, including the 2003 Invasion of Iraq. The government appoints the chief of the Defence Force from one of the armed services; the current chief is Air Chief Marshal Angus Houston. In 2005–06, the defence budget is A$17.5bn.

Geography and climate

Angus Houston Australia's 7,686,850 km² (2,967,909 mi²) landmass is on the Indo-Australian Plate. Surrounded by the Indian, Southern and Pacific oceans, Australia is separated from Asia by the Arafura and Timor seas. Australia has a total 25,760 km (16,007 mi) of coastline and claims an extensive Exclusive Economic Zone of 8,148,250 km² or 3,146,057 mi² (excluding the Australian Antarctic Territory). Climate is highly influenced by ocean currents, including the El Niño southern oscillation, which is correlated with periodic drought, and the seasonal tropical low pressure system that produces cyclones in northern Australia. By far the largest part of Australia is desert or semi-arid. Australia is the driest inhabited continent, the flattest, and has the oldest and least fertile soils. Only the south-east and south-west corners of the continent have a temperate climate. The northern part of the country, with a tropical climate, has a vegetation consisting of rainforest, woodland, grassland and desert. The Great Barrier Reef, the world's largest coral reef, lies a short distance off the north-east coast and extends for over 2,000 km (1,250 mi). The world's two largest monoliths are located in Australia, Mount Augustus in Western Australia is the largest and Uluru in central Australia is the second largest. At 2,228 m (7,310 ft), Mount Kosciuszko on the Great Dividing Range is the highest mountain on the Australian mainland, although Mawson Peak on the remote Australian territory of Heard Island is taller at 2,745 m (9,006 ft).

Flora and fauna

Heard Island of the wallaby is currently being sequenced; when the sequencing is completed, it will be a major contribution to marsupial biology.]] Although most of Australia is semi-arid or desert, it covers a diverse range of habitats, from alpine heaths to tropical rainforests. Because of the great age and consequent low levels of fertility of the continent, its extremely variable weather patterns, and its long-term geographic isolation, much of Australia's biota is unique and diverse. About 85% of flowering plants, 84% of mammals, more than 45% of birds, and 89% of in-shore, temperate-zone fish are endemic. Many of Australia's ecoregions, and the species within those regions, are threatened by human activities and introduced plant and animal species. The federal Environment Protection and Biodiversity Conservation Act 1999 is a legal framework used for the protection of threatened species. Numerous protected areas have been created to protect and preserve Australia's unique ecosystems, 64 wetlands are registered under the Ramsar Convention, and 16 World Heritage Sites have been established. Australia was ranked 13th in the World on the 2005 Environmental Sustainability Index. Environmental Sustainability Index.]] Most Australian plant species are evergreen and many are adapted to fire and drought, including the eucalypts and acacias. Australia has a rich variety of endemic legume species that thrive in nutrient-poor soils because of their symbiosis with Rhizobia bacteria and mycorrhizal fungi. Well-known Australian fauna include monotremes (the platypus and echidna), and a host of marsupials, including the koala, kangaroo, wombat, and birds such as the emu, cockatoo, and kookaburra. The dingo was introduced by Austronesian people that traded with Indigenous Australians around 4000 BCE. Many plant and animal species became extinct soon after human settlement, including the Australian megafauna; many more have become extinct since European settlement, among them the Thylacine (Tasmanian Tiger).

Economy

Thylacine Australia has a prosperous, Western-style mixed economy, with a per capita GDP slightly higher than those of the UK, Germany and France. The country was ranked third in the United Nations' 2005 Human Development Index and sixth in The Economist worldwide quality-of-life index 2005. In recent years, the Australian economy has been resilient in the face of global economic downturn. Rising output in the domestic economy has been offsetting the global slump, and business and consumer confidence remains robust. Australia's emphasis on reform is another key factor behind the economy's strength. In the 1980s, the Labor Party, led by Prime Minister Bob Hawke and Treasurer Paul Keating, started the process of modernising the Australian economy by floating the Australian dollar in 1983, and deregulating the financial system. Since 1996, the Howard government has continued the process of micro-economic reform, including the partial deregulation of the labour market and the privatisation of state-owned businesses, most notably in the telecommunications industry. Substantial reform of the indirect tax system was achieved in July 2000 with the introduction of a 10% Goods and Services Tax, which has slightly reduced the heavy reliance on personal and company income tax that still characterises Australia's tax system. The Australian economy has not suffered a recession since the early 1990s. As of July 2005, unemployment was 5.0% with 10,030,300 persons employed. The service sector of the economy, including tourism, education, and financial services, comprises 69% of GDP. Agriculture and natural-resources represent only 3% and 5% of GDP, respectively, but contribute substantially to Australia's export performance. Australia's largest export markets include Japan, China, the United States, South Korea and New Zealand. Areas of concern to some economists include the chronically high current account deficit and also high levels of net foreign debt.

Demographics

current account deficit Most of the estimated 20.4 million Australians are descended from 19th- and 20th-century immigrants, the majority from Britain and Ireland. Australia's population has quadrupled since the end of World War I , spurred by an ambitious immigration program. In 2001, the five largest groups of the 27.4% of Australians who were born overseas were from the United Kingdom, New Zealand, Italy, Vietnam and China. Following the abolition of the White Australia policy, numerous government initiatives have been established to encourage and promote racial harmony based on a policy of multiculturalism. Australia’s population has increased by about 60 times since European settlement. The self-declared indigenous population—including Torres Strait Islanders, who are of Melanesian descent—was 410,003 (2.2% of the total population) in 2001, a significant increase from the 1977 census, which showed an indigenous population of 115,953. Indigenous Australians have higher rates of imprisonment and unemployment, lower levels of education and life expectancies for males and females that are 17 years lower than those of other Australians. Perceived racial inequality is an ongoing political and human rights issue for Australians. human rights.]] In common with many other developed countries, Australia is experiencing a demographic shift towards an older population, with more retirees and fewer people of working age. A large number of Australians (759,849 for the period 2002–03) live outside their home country. Australia has maintained one of the most active immigration programs in the world to boost population growth. Most immigrants are skilled; the quota includes categories for family members and refugees. English is the official language, and is spoken and written in a distinct variety known as Australian English. According to the 2001 census, English is the only language spoken in the home for around 80% of the population. The next most common languages spoken at home are Chinese (2.1%), Italian (1.9%) and Greek (1.4%). A considerable proportion of first- and second-generation migrants are bilingual. It is believed that there were between 200 and 300 Australian Aboriginal languages at the time of first European contact. Only about 70 of these languages have survived, and all but 20 of these are now endangered. An indigenous language remains the main language for about 50,000 (0.02%) people. Australia has a sign language known as Auslan, which is the main language of about 6,500 deaf people. The Australian Constitution guarantees the separation of church and state; there is no state religion. The 2001 census identified that 68% of Australians call themselves Christian: 27% identifying themselves as Roman Catholic and 21% as Anglican. Five per cent of Australians identify themselves as followers of non-Christian religions, and 26% as non-religious. Like many Western countries, the level of active participation in church worship is much lower than this; weekly attendance at church services is about 1.5 million, about 7.5% of the population. School attendance is compulsory throughout Australia between the ages of 6–15 years (16 years in South Australia and Tasmania), contributing to an adult literacy rate that is assumed to be 99%. Government grants have supported the establishment of Australia's 38 universities, and although several private universities have been established, the majority receive government funding. There is a state-based system of vocational training colleges, known as TAFE Institutes, and many trades conduct apprenticeships for training new tradespeople. Approximately 58% of Australians between the ages of 25 and 64 have vocational or tertiary qualifications.

Culture

apprenticeship.]] The primary basis of Australian culture up until the mid-20th century was Anglo-Celtic, although distinctive Australian features had been evolving from the environment and indigenous culture. Over the past 50 years, Australian culture has been strongly influenced by American popular culture (particularly television and cinema), large-scale immigration from non-English-speaking countries, and Australia's Asian neighbours. Australia has a long history of visual arts, starting with the cave and bark paintings of its indigenous peoples. From the time of European settlement, a common theme in Australian art has been the Australian landscape, seen in the works of Arthur Streeton, Arthur Boyd and Albert Namatjira, among others. The traditions of indigenous Australians are largely transmitted orally and are closely tied to ceremony and the telling of the stories of the Dreamtime. Australian Aboriginal music, dance and art have a palpable influence on contemporary Australian visual and performing arts. Australia has an active tradition of music, ballet and theatre; many of its performing arts companies receive public funding through the federal government's Australia Council. There is a symphony orchestra in each capital city, and a national opera company, Opera Australia, first made prominent by the renowned diva Dame Joan Sutherland; Australian music includes classical, jazz, and many popular music genres. Australian literature has also been influenced by the landscape; the works of writers such as Banjo Paterson and Henry Lawson captured the experience of the Australian bush. The character of colonial Australia, as embodied in early literature, resonates with modern Australia and its perceived emphasis on egalitarianism, mateship, and anti-authoritarianism. In 1973, Patrick White was awarded the Nobel Prize in Literature, the only Australian to have achieved this; he is recognised as one of the great English-language writers of the 20th century. Australian English is a major variety of the language; its grammar and spelling are largely based on those of British English, overlaid with a rich vernacular of unique lexical items and phrases, some of which have found their way into standard English. Australia has two public broadcasters (the ABC and SBS), three commercial television networks, three pay TV services, and numerous public, non-profit television and radio stations. Australia's film industry has achieved critical and commercial successes. Each major city has daily newspapers, and there are two national daily newspapers, The Australian and The Australian Financial Review. According to Reporters Without Borders in 2005, Australia is in 31st position on a list of countries ranked by press freedom, behind New Zealand (9th) and the United Kingdom (28th) but ahead of the United States. This ranking is primarily due to the limited diversity of commercial media ownership in Australia. Most Australian print media in particular is under the control of either News Corporation or John Fairfax Holdings. John Fairfax Holdings Sport is an important part of Australian culture, assisted by a climate that favours outdoor activities; 23.5% Australians over the age of 15 regularly participate in organised sporting activities. At an international level, Australia has particularly strong teams in cricket, field hockey, netball, rugby league, rugby union, and performs well in cycling and swimming. Australia has participated in every summer Olympic Games of the modern era, and every Commonwealth Games. Australia has hosted the 1956 and 2000 Summer Olympics, and has ranked among the top five medal-takers since 2000. It has also hosted the 1938, 1962 and 1982 Commonwealth Games, and will host the 2006 Commonwealth Games in Melbourne. Australian rules football is one of the most popular national sports, albeit it, one that is only played in Australia; players gain some international prominence through International Rules which is an annual meeting between the Australian code and Irish Gaelic Football. Corporate and government sponsorship of many sports and élite athletes is common in Australia. Televised sport is popular; some of the highest rating television programs include the summer Olympic Games and the grand finals of local and international football competitions.

Related topics

References

Gillespie, R. (2002). Dating the first Australians. Radiocarbon 44:455-472
Smith, L. (1980), The Aboriginal Population of Australia, Australian National University Press, Canberra
Tatz, C. (1999). [http://www.aiatsis.gov.au/rsrch/rsrch_dp/genocide.htm Genocide in Australia], AIATSIS Research Discussion Papers No 8, Australian Institute of Aboriginal and Torres Strait Islander Studies, Canberra
Windschuttle, K. (2001). [http://www.newcriterion.com/archive/20/sept01/keith.htm# The Fabrication of Aboriginal History], The New Criterion Vol. 20, No. 1, September 20.
Bean, C. Ed. (1941). [http://www.awm.gov.au/histories/ww1/1/index.asp Volume I - The Story of Anzac: the first phase], First World War Official Histories 11th Edition.
Australian Electoral Commission (2000). [http://www.aec.gov.au/_content/when/referendums/1999_report/index.htm 1999 Referendum Reports and Statistics]
Parliamentary Library (1997). [http://www.aph.gov.au/library/pubs/rn/1997-98/98rn25.htm The Reserve Powers of the Governor-General]
Australian Government. (2005). [http://www.budget.gov.au/ Budget 2005-2006]
Department of the Environment and Heritage. [http://www.deh.gov.au/biodiversity/about-biodiversity.html About Biodiversity]
Macfarlane, I. J. (1998). [http://www.rba.gov.au/PublicationsAndResearch/Bulletin/bu_oct98/bu_1098_2.pdf Australian Monetary Policy in the Last Quarter of the Twentieth Century]. Reserve Bank of Australia Bulletin, October
Parham, D. (2002). [http://www.pc.gov.au/research/confproc/mrrag/mrrag.pdf Microeconomic reforms and the revival in Australia’s growth in productivity and living standards]. Conference of Economists, Adelaide, 1 October
Australian Bureau of Statistics. Labour Force Australia. Cat#6202
Australian Bureau of Statistics. [http://www.abs.gov.au/ausstats/abs@.nsf/94713ad445ff1425ca25682000192af2/1a79e7ae231704f8ca256f720082feb9!OpenDocument Year Book Australia 2005]
Department of Foreign Affairs and Trade (2003). Advancing the National Interest, [http://www.dfat.gov.au/ani/appendix_one.pdf Appenidix 1]
Australian Bureau of Statistics. 2001 Census, [http://www.abs.gov.au/ausstats/abs@census.nsf/ddc9b4f92657325cca256c3e000bdbaf/7dd97c937216e32fca256bbe008371f0!OpenDocument A Snapshot of Australia]
Department of Immigration, Multicultural and Indigenous Affiars. (2005). [http://www.immi.gov.au/facts/06evolution.htm The Evolution of Australia's Multicultural Policy]
Parliament of Australia, Senate (2005). [http://www.aph.gov.au/Senate/committee/legcon_ctte/expats03/ Inquiry into Australian Expatriates]
[http://www.ncls.org.au/default.aspx?docid=2250&track=82083 NCLS releases latest estimates of church attendance], National Church Life Survey, Media release, 28 February 2004
Australian Film Commission. What are Australians Watching?, [http://www.afc.gov.au/gtp/freetv.html Free-to-Air, 1999-2004 TV]
Australian Bureau of Statistics, [http://www.abs.gov.au/Ausstats/abs@.nsf/0/68180154bf128d91ca2569d000164365?OpenDocument Population Growth - Australia’s Population Growth]

External links


- [http://wikitravel.org/en/Australia Wikitravel guide to Australia]
- [http://www.gov.au/ Australian Government Entry Portal]
- [http://www.australia.gov.au/ Commonwealth Government Online]
- [http://www.immi.gov.au/ Department of Immigration and Multicultural and Indigenous Affairs (DIMIA)]
- [http://www.dfat.gov.au/g