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| black coal A natural black graphitelike material used as a fuel, formed from fossilized plants and consisting of amorphous carbon with various organic and some inorganic compounds | |||
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akmenogles : 8 a las frases, 5 temas |
| Ambiente | 2 |
| Carbón | 3 |
| Ecología | 1 |
| Economía | 1 |
| Química | 1 |