Coal

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

angle of repose

Energy; Coal

The angle, measured to the horizon, after which sediments or material will slide or fall.

angle of dip

Energy; Coal

The angle or degree to which sedimentary rock or "strata" is inclined.

airway

Energy; Coal

Any corridor from which air flows through.

anemometer

Energy; Coal

Any tool or instrument used to measure air velocity.

clay vein

Energy; Coal

Clay or a material like clay that that fills a hollow area in a coal mine.

Clean Air Act Amendments of 1990

Energy; Coal

Originally passed by the U.S. congress in 1963, it was amended in 1970 and 1990. The 1990 amendment addressed issues such as emissions trading, acid rain, ozone depletion.