Stone Age
Stone Age, prehistoric cultural stage, or level of human development characterized by the creation and use of stone tools. The Stone Age, whose origin…
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Stone Age, prehistoric cultural stage, or level of human development characterized by the creation and use of stone tools. The Stone Age, whose origin…
Silver (Ag), chemical element, a white lustrous metal valued for its decorative beauty and electrical conductivity. Silver is located in Group 11 (Ib) and…
Gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table. Gold has several qualities that…
Metallurgy, art and science of extracting metals from their ores and modifying the metals for use. Metallurgy customarily refers to commercial as…
Mineral deposit, aggregate of a mineral in an unusually high concentration. About half of the known chemical elements possess some metallic properties. The term metal, however, is reserved for…
Smelting Perhaps 1,000 years after humans learned about melting virgin copper, they found that still another stone, a brittle one directly…
Ore, a natural aggregation of one or more minerals that can be mined, processed, and sold at a profit. An…
Mining, process of extracting useful minerals from the surface of the Earth, including the seas. A mineral, with a few exceptions, is an…
Mineral, naturally occurring homogeneous solid with a definite chemical composition and a highly ordered atomic arrangement; it is usually formed by inorganic processes. There are several thousand…
Sintering, the welding together of small particles of metal by applying heat below the melting point. The process may be used in steel manufacturing—to form…