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Materials science introduction questions

1. Elemental copper does occur in nature, but copper is mainly extracted from its sulfide, carbonate or oxide minerals. Tin does not occur naturally in the elemental state. The main ore of tin is cassiterite, SnO2. Bronze is an alloy of copper and tin. In ancient civilizations the Stone Age was followed by the Bronze Age, which was then followed by the Iron Age. These are named after the materials that early man used...

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