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bpv coal

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 Coal is a combustible black or brownishblack sedimentary rock normally 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 sulfur, hydrogen, oxygen and nitrogen] Example chemical structure of coal  Coal begins as layers of plant m
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   Coal is acombustibleblack or brownish-blacksedimentary rocknormally occurring inrock stratain layers or veins called c oal beds or  c oal seams .The harder forms, such asanthracite coal, can beregarded asmetamorphic rockbecause of later exposure to elevated temperature and pressure. Coalis composed primarily ofcarbonalong with variablequantities of other elements,chieflysulfur ,hydrogen,oxygenandnitrogen ] Example chemical structure of coal   Coal begins as layers of plant matter accumulate atthe bottom of a body of water. For the process tocontinue the plant matter must be protected frombiodegradationandoxidization, usually by mud or  acidic water. The wide shallow seas oftheCarboniferousperiodprovided such conditions.This trapped atmospheric carbon in the ground inimmensepeatbogsthat eventually were coveredover and deeply buried by sediments under whichtheymetamorphosedinto coal. Over time, thechemical andphysical propertiesof the plant remains(believed to mainly have beenfern-like speciesantedating more modern plant andtreespecies)were changed by geological action to create a solidmaterial.
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