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=History of Copper=

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The exact date of the discovery of copper is unknown; the earliest estimate is around 9000 BC. In Northern Iraq, a pendant dating back to 8700 BC was found. Copper was the only metal known to man for nearly 5000 years, and the first to be mined and crafted. The discovery of copper also laid the grounds for the iron and steel industries, not just the copper industry. Copper is found in volcanic areas with high concentrations of hot solutions. Pure copper is rare, and to obtain it requires smelting, leaching, or electrolysis. Smelting, or fusing/melting to separate metal from ore, was the original process used. The most common forms of copper are brasses, which are copper-zinc alloys, and bronze, which is a copper-tin alloy. Copper's name comes from the island Cyprus, where the Roman Empire often gained its copper. Copper is used in computers for chips and circuits. Also, it is a great conductor for electricity. In American currency, the penny was 95% copper and 5% zinc but in 1982 the make-up changed to mostly zinc with a copper coating on the outside.



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Sources: http://www.rameria.com/inglese/history.html http://www.copper.org/education/history/g_fact.html http://www.csa.com/discoveryguides/copper/overview.php http://education.jlab.org/itselemental/ele029.html http://web1.caryacademy.org/chemistry/rushin/StudentProjects/ElementWebSites/copper/uses_of_copper.htm