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

job safety analysis (j.s.a.)

Mining; Coal

A method used to define and determine the proper means of performing a job, the potential hazards associated and recommendations on how to reduce the likelihood of accidents occurring.

kettle bottom

Mining; Coal

A cylindrical shaped rock that can dangerously fall from the roofs of mines. It is believed these may be tree fossils from their odd and specific shapes.