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Using points and examples from the talk, explain the two possible ways early humans discovered how to use fire to release copper from solid rock.
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| Post dates | Users | rates | Contents |
|---|---|---|---|
| 2019-10-02 | bishoy | 66.00 | Check this speaking |
| 2019-10-02 | bishoy | Check this speaking | |
| 2019-10-02 | bishoy | 83.00 | Check this speaking |
| 2019-10-02 | bishoy | 66.00 | Check this speaking |
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