Coal is a black or brown rock, often black in color, flammable and combustible. It is found in ground layers or veins. It consists mainly of carbon, in addition to varying proportions of other elements (primarily hydrogen, sulfur, oxygen, and nitrogen in addition to other elements). [1] ] Coal is a sedimentary rock that forms as layers of rock called coal seams. Coal is formed when dead plants decompose into peat, transformed by the high heat and pressure of burial over millions of years. Although coal mostly forms in stratigraphic sediments, these deposits may be exposed to extremely high temperatures and pressures from igneous interference or deformation in the formation process (ie mountain-forming processes), which may lead to the development of anthracite and even graphite.
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