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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Industry: Energy
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Coal
active workings
Energy; Coal
Mines, or places in mines where miners work, which have been inspected and are ventilated.
angle of repose
Energy; Coal
The angle, measured to the horizon, after which sediments or material will slide or fall.
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