Coal is a black,carbonaceous material that forms as the result of compaction of vegetable debris over long periods of time. Anthracite is a hard,brittle material containing more than 90% carbon. It is lustrous,and burns slowly with a smokeless flame | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Arem, Joel |
Taille de l’image : | 3833 px × 2550 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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