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| coal The natural, rocklike, brown to black derivative of forest-type plant material, usually accumulated in peat beds and progressively compressed and indurated until it is finally altered in to graphite-like material | |||
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ogle : 25 phrases in 6 subjects |
| Chemistry | 8 |
| Economics | 3 |
| Energy industry | 2 |
| Environment | 7 |
| General | 4 |
| Politics | 1 |