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The top documents tagged [smelting process slide]
Copper Copper was discovered in 9000 BC by the middle east, copper is a chemical metal with the symbol Cu and the atomic number 29, copper is ductile
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Acid Deposition Lake Barkevatn in Norway used to have healthy stocks of trout and perch. As a result of acid rain, the trout stock died out in the mid-1970s
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