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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 a las frases, 6 temas |
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| Economía | 3 |
| General | 4 |
| Industria energetica | 2 |
| Política | 1 |
| Química | 8 |