21 Terms
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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
coal reserves
Energy; Coal
The amount in tons of coal that is estimated to be present in a specific area.
clean coal technologies
Energy; Coal
Terminology referring to technologies that greatly reduce the emissions of coal in an effort to protect the environment and reduce acid rain.
coal washing
Energy; Coal
A process of separating coal from other less desirable materials because coal has a different density and floats.
