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Human History: Stone age, Copper Age, Bronze Age, Iron Age.

Every year > 25,000 pounds (11.3 metric tons) of new non-fuel minerals must be provided for you, and each person in the US, to make the items that each of us use every day. Human History: Stone age, Copper Age, Bronze Age, Iron Age.

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6 6 10 na - PowerPoint PPT Presentation

Human History: Stone age, Copper Age, Bronze Age, Iron Age.