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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 | |||
| coal | |||
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akmenogles : 8 phrases, 5 sujets |
| Charbon | 3 |
| Chimie | 1 |
| Écologie | 1 |
| Économie | 1 |
| Environnement | 2 |