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| coal | |||
| 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 do fraz, 5 tematyki |
| Chemia | 1 |
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| Ochrona środowiska | 2 |
| Węgiel | 3 |