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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Arem, Joel |
Bildgröße: | 3833 px × 2550 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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