coal

Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.

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post #5617846
↑11♥17C0S
post #5575908
↑26♥31C0S
post #5544674
↑10♥3C0S
post #5534626
↑189♥185C11S