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ores | A Wisdom Archive on ores | | ores A selection of articles related to ores | |
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ores, Ore, Ore - Important ore minerals, Mineral resource classification, Economic geology
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| ARTICLES RELATED TO ores | | | |  ores: Encyclopedia II - Democratic Republic of the Congo - HistoryThe earliest inhabitants of the area were Pygmy peoples. They were largely replaced and absorbed by Bantu tribes during Bantu migrations.
Democratic Republic of the Congo - Congolese pre-history.
Main article: Early Congolese History
From 2000 BC to AD 500, waves of Bantu migrations moved into what is now the Democratic Republic of the Congo (Although the term "Congo" usually encompasses neighboring Congo-Brazzaville as well) from the northwest, adding to and displacing the indig ...
See also:Democratic Republic of the Congo, Democratic Republic of the Congo - History, Democratic Republic of the Congo - Congolese pre-history, Democratic Republic of the Congo - Medieval kingdoms, Democratic Republic of the Congo - European exploration and administration 1870–1960, Democratic Republic of the Congo - Political Crises 1960-1965, Democratic Republic of the Congo - Zaire 1965–1996, Democratic Republic of the Congo - War 1996–present, Democratic Republic of the Congo - Politics, Democratic Republic of the Congo - Political divisions, Democratic Republic of the Congo - Provinces, Democratic Republic of the Congo - Major cities, Democratic Republic of the Congo - Geography, Democratic Republic of the Congo - Economy, Democratic Republic of the Congo - Demographics, Democratic Republic of the Congo - Languages, Democratic Republic of the Congo - Culture, Democratic Republic of the Congo - Flora and fauna, Democratic Republic of the Congo - Miscellaneous topics Read more here: » Democratic Republic of the Congo: Encyclopedia II - Democratic Republic of the Congo - History |
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| | | | | ores: Encyclopedia II - Hydrogen - Basic features Hydrogen is the lightest chemical element; its most common isotope comprises just one negatively charged electron, distributed around a positively charged proton (the nucleus of the atom). The electron is bound to the proton by the Coulomb force, the electrical force that one stationary, electrically charged nanoparticle exerts on another. The hydrogen atom has special significance in quantum mechanics as a simple physical system for which there is an exact solution to the Schrödinger equation; from that equation, the experimentally observe ...
See also:Hydrogen, Hydrogen - Basic features, Hydrogen - Applications, Hydrogen - History, Hydrogen - Electron energy levels, Hydrogen - Occurrence, Hydrogen - Compounds, Hydrogen - Forms, Hydrogen - Isotopes, Hydrogen - Biology Read more here: » Hydrogen: Encyclopedia II - Hydrogen - Basic features |
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| | | | | ores: Encyclopedia II - Early Congolese History - The Eve of Colonial Rule
Early Congolese History - The Kuba Federation.
The Kuba Kingdom, or more accurately, the Kuba Federation, was a political entity (one comprising a collection of approximately twenty Bantu ethnic groups) that began to develop out of a number of decentralized, ethnically Bantu states (namely the Luba, the Leele, and the Wongo ethnic groups).
The federation’s capital was Nsheng, which is now modern Mushenge. The name “Kuba” is derived from the term used by the Lub ...
See also:Early Congolese History, Early Congolese History - Early History, Early Congolese History - Expansion of the Bantu, Early Congolese History - The Upemba and Luba cultures, Early Congolese History - The Eve of Colonial Rule, Early Congolese History - The Kuba Federation, Early Congolese History - The Kongo Empire, Early Congolese History - Other States, Early Congolese History - The Effects of Geography and Climate Read more here: » Early Congolese History: Encyclopedia II - Early Congolese History - The Eve of Colonial Rule |
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| | | | | | ores: Encyclopedia II - Magnetism - Types of magnets
Magnetism - Electromagnets.
Electromagnets are useful in cases where a magnet must be switched on or off; for instance, large cranes to lift junked automobiles.
For the case of electric current moving through a wire, the resulting field is directed according to the "right hand rule." If the right hand is used as a model, and the thumb of the right hand points along the wire from positive towards the negative side ("conventional current", the reverse of the direction of actual movement of electrons), then t ...
See also:Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles ., Magnetism - Magnetic monopoles ., Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units, Magnetism - Footnotes Read more here: » Magnetism: Encyclopedia II - Magnetism - Types of magnets |
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| | | | | ores: Encyclopedia II - Iron - 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 a ...
See also:Iron, Iron - Notable characteristics, Iron - Applications, Iron - History, Iron - Occurrence, Iron - Extraction from ore, Iron - Compounds, Iron - Isotopes, Iron - Biological role, Iron - Precautions Read more here: » Iron: Encyclopedia II - Iron - History |
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| | | | | ores: Encyclopedia II - Igneous rock - Magma origination The Earth's crust is about 35 kilometers thick under the continents, but averages only some 7-10 kilometers beneath the oceans. The continental crust is composed primarily of crystalline basement; stable igneous and metamorphic rocks such as granulite, granite and various other intrusive rocks. Oceanic crust is composed primarily of basalt, gabbro and peridotite.
The crust floats on the asthenospheric mantle, which is convecting due to the forces of plate tectonics. The mantle, which extends to a depth of nearly 3,000 kilometer ...
See also:Igneous rock, Igneous rock - Magma origination, Igneous rock - Morphology and Setting, Igneous rock - Intrusive Igneous Rocks, Igneous rock - Extrusive Igneous Rocks, Igneous rock - Classification, Igneous rock - Texture, Igneous rock - Chemical Classification, Igneous rock - Mineralogical Classification, Igneous rock - Example of classification, Igneous rock - Etymology, Igneous rock - Reference Read more here: » Igneous rock: Encyclopedia II - Igneous rock - Magma origination |
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| | | | | ores: Encyclopedia II - Sulfide - Safety Many metal sulfides are so insoluble that they are probably not very toxic. Some metal sulfides, when exposed to a strong mineral acid - and this includes your stomach acids - , will release toxic hydrogen sulfide.
Organic sulfides are of course highly flammable. When a sulfide burns, the fumes usually include toxic sulfur dioxide (SO2) gas.
Meyer, B.; Ward, K.; Koshlap, K.; & Peter ...
See also:Sulfide, Sulfide - Examples, Sulfide - Uses, Sulfide - Natural occurrence, Sulfide - Safety Read more here: » Sulfide: Encyclopedia II - Sulfide - Safety |
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| | | | | | ores: Encyclopedia II - Geology - History In China, the polymath Shen Kua (1031 - 1095) formulated a hypothesis for the process of land formation: based on his observation of fossil shells in a geological stratum in a mountain hundreds of miles from the ocean, he inferred that the land was formed by erosion of the mountains and by deposition of silt.
The work on rocks Peri lithon by Theophrastus, a student of Aristotle, remained authoritative for millennia. However, its interpretation of fossils was not overturned until after the Scientific Revolution. It was translate ...
See also:Geology, Geology - History, Geology - Important principles of geology, Geology - Fields or related disciplines, Geology - Regional geology, Geology - Australia, Geology - United Kingdom, Geology - United States, Geology - National geology, Geology - Planetary geology Read more here: » Geology: Encyclopedia II - Geology - History |
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| | | | | ores: Encyclopedia II - Zinc - Applications Zinc is the fourth most common metal in use, trailing only iron, aluminium, and copper in annual production.
Zinc is used to galvanise metals such as steel to prevent corrosion.
Zinc is used in alloys such as brass, nickelled silver, typewriter metal, various soldering formulas and German silver.
Zinc is the primary metal used in making American pennies since 1982.
Zinc is used in die casting noteably in the automobile industry.
Zinc is used as part of the containers of batteries.
Zin ...
See also:Zinc, Zinc - Notable characteristics, Zinc - Applications, Zinc - Popular misconceptions, Zinc - History, Zinc - Biological role, Zinc - Food Sources, Zinc - Zinc Deficiency, Zinc - Zinc Toxicity, Zinc - Psoriasis, Zinc - Immune System, Zinc - Abundance, Zinc - Zinc production, Zinc - Compounds, Zinc - Isotopes, Zinc - Precautions Read more here: » Zinc: Encyclopedia II - Zinc - Applications |
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| | | | | | ores: Encyclopedia II - Bismuth - Notable characteristics It is a brittle metal with a pinkish hue with an iridescent tarnish. Among the heavy metals, bismuth is unusual in that its toxicity is much lower that that of its neighbors in the periodic table such as lead, thallium and antimony. Traditionally, it has also been regarded as the element with the heaviest stable isotope, but this is now known to be not quite true (see below). No other metal is more naturally diamagnetic (as opposed to superdiamagnetic) than bismuth. It occurs in its native form, and has a high electrical resistance. Of any m ...
See also:Bismuth, Bismuth - Notable characteristics, Bismuth - Applications, Bismuth - Crystals, Bismuth - History, Bismuth - Occurrence Read more here: » Bismuth: Encyclopedia II - Bismuth - Notable characteristics |
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| | | | | ores: Encyclopedia II - Democratic Republic of the Congo - History
Democratic Republic of the Congo - Congolese pre-history.
From 2000 BC to AD 500, waves of Bantu migrations moved into what is now the Democratic Republic of the Congo (Although the term "Congo" usually encompasses neighboring Congo-Brazzaville as well) from the northwest, adding to and displacing the indigenous Pygmy populations into the southern regions of the modern DRC state. Subsequent migrations from the Darfur and Kordofan regions of Sudan into the northeast, as well as East Africans migrating into the eas ...
See also:Democratic Republic of the Congo, Democratic Republic of the Congo - History, Democratic Republic of the Congo - Congolese pre-history, Democratic Republic of the Congo - Medieval kingdoms, Democratic Republic of the Congo - European exploration and administration 1870–1960, Democratic Republic of the Congo - Political Crises 1960-1965, Democratic Republic of the Congo - Zaire 1965–1996, Democratic Republic of the Congo - War 1996–present, Democratic Republic of the Congo - Politics, Democratic Republic of the Congo - Political divisions, Democratic Republic of the Congo - Provinces, Democratic Republic of the Congo - Major cities, Democratic Republic of the Congo - Geography, Democratic Republic of the Congo - Economy, Democratic Republic of the Congo - Demographics, Democratic Republic of the Congo - Languages, Democratic Republic of the Congo - Culture, Democratic Republic of the Congo - Flora and fauna, Democratic Republic of the Congo - Miscellaneous topics Read more here: » Democratic Republic of the Congo: Encyclopedia II - Democratic Republic of the Congo - History |
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| | | | | ores: Encyclopedia II - Cobalt - Applications Co-60 is useful as a gamma ray source partially because it can be produced - in known quantity, and very large amounts - by simply exposing natural cobalt to neutrons in a reactor for a given time.
Cobalt - Use in medicine.
Cobalt-60 (Co-60 or 60Co) is a radioactive metal that is used in radiotherapy. It produces two gamma rays with energies of 1.17 MeV and 1.33 MeV. The 60Co source is about 2 cm in diameter and as a result produces a geometric penumbra, making the edge of the radiati ...
See also:Cobalt, Cobalt - Notable characteristics, Cobalt - Applications, Cobalt - Use in medicine, Cobalt - History, Cobalt - Biological role, Cobalt - Occurrence, Cobalt - Compounds, Cobalt - Isotopes, Cobalt - Precautions Read more here: » Cobalt: Encyclopedia II - Cobalt - Applications |
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| | | | | | | ores: Encyclopedia II - Hydrogen - Basic features Hydrogen is the lightest chemical element; its most common isotope comprises just one negatively charged electron, distributed around a positively charged proton (the nucleus of the atom). The electron is bound to the proton by the Coulomb force, the electrical force that one stationary, electrically charged nanoparticle exerts on another. The hydrogen atom has special significance in quantum mechanics as a simple physical system for which there is an exact solution to the Schrödinger equation; from that equation, the experimentally observe ...
See also:Hydrogen, Hydrogen - Basic features, Hydrogen - Applications, Hydrogen - History, Hydrogen - Electron energy levels, Hydrogen - Occurrence, Hydrogen - Compounds, Hydrogen - Forms, Hydrogen - Isotopes Read more here: » Hydrogen: Encyclopedia II - Hydrogen - Basic features |
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| | | | | | ores: Encyclopedia II - Magnetism - Types of magnets
Magnetism - Electromagnets.
Electromagnets are useful in cases where a magnet must be switched on or off; for instance, large cranes to lift junked automobiles.
For the case of electric current moving through a wire, the resulting field is directed according to the "right hand rule." If the right hand is used as a model, and the thumb of the right hand points along the wire from positive towards the negative side ("conventional current", the reverse of the direction of actual movement of electrons), then t ...
See also:Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles, Magnetism - Magnetic monopoles, Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units Read more here: » Magnetism: Encyclopedia II - Magnetism - Types of magnets |
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| | | | | ores: Encyclopedia II - Cobalt - Isotopes Naturally occurring cobalt is composed of 1 stable isotope, 59-Co (59Co). 22 radioisotopes have been characterized with the most stable being 60Co with a half-life of 5.2714 years, 57-Co (57Co) with a half-life of 271.79 days, and 56-Co (56Co) with a half-life of 77.27 days, and 58-Co (58Co) with a half life of 70.86 days. All of the remaining radioactive isotopes have half-lifes that are less than 18 hours and the majority of these have half lives that are less than 1 second. This element also has 4 meta states, all of which ha ...
See also:Cobalt, Cobalt - Notable characteristics, Cobalt - Applications, Cobalt - Use in medicine, Cobalt - History, Cobalt - Biological role, Cobalt - Occurrence, Cobalt - Compounds, Cobalt - Isotopes, Cobalt - Precautions Read more here: » Cobalt: Encyclopedia II - Cobalt - Isotopes |
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| | | | | ores: Encyclopedia II - Cobalt - Precautions Powdered cobalt in metal form is a fire hazard. Cobalt compounds should be handled with care due to cobalt's slight toxicity.
Cobalt-60 is a powerful gamma ray emitter and exposure to 60Co is therefore a cancer risk. Ingestion of 60Co will lead to incorporation of some cobalt into tissues, which is released very slowly. Cobalt-60 is a risk factor in a nuclear confrontation because neutron emissions will convert iron into this isotope. Some nuclear weapon designs could intentionally increase the amount of Cobalt-6 ...
See also:Cobalt, Cobalt - Notable characteristics, Cobalt - Applications, Cobalt - Use in medicine, Cobalt - History, Cobalt - Biological role, Cobalt - Occurrence, Cobalt - Compounds, Cobalt - Isotopes, Cobalt - Precautions Read more here: » Cobalt: Encyclopedia II - Cobalt - Precautions |
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