History
History, 28.06.2019 13:30, hanz73

6. the average copper ore mined in 1900 was five percent copper by weight. copper ore mined in 1990 was approximately 0.5 percent copper by weight. what factors could account for this difference? "

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6. the average copper ore mined in 1900 was five percent copper by weight. copper ore mined in 1990...

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