Coal: Difference between revisions
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Revision as of 11:08, 24 December 2022
- Not to be confused with Charcoal
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. Coal is primarily used as a fuel.
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| This article uses material from the Wikipedia article Coal, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors). | 
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