Physics, 04.02.2020 11:56 rjmarin592ovzbn9
1. minerals are naturally occurring, substances with a fixed crystal structure and a unique chemical composition.
2. processing ore sometimes involves or grinding minerals.
3. prehistoric people used for knives and arrowheads.
4. the average american house contains about pounds of minerals.
5. early used rocks as simple tools as early as 2.6 million years ago.
Answers: 3
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