Since the 13th century coal is derived from the Old English term col, which means "mineral of fossilized carbon".
Coal consists of high content of carbon and other elements like, sulfur, hydrogen, oxygen, and nitrogen.
Coal is a naturally black sedimentary rock occurring in rock strata in layers or veins called coal beds or coal seams.
Anthracite coal is the solider form of coal, can be considered as metamorphic rock because of later exposure to high temperature and pressure.
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