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Coal

Origins Of Coal, Composition Of Coal, Properties And Reactions, Environmental Problems Associated With The Burning Of Coal

Coal is a naturally occurring combustible material consisting primarily of the element carbon, but with low percentages of solid, liquid, and gaseous hydrocarbons and other materials, such as compounds of nitrogen and sulfur. Coal is usually classified into the sub-groups known as anthracite, bituminous, lignite, and peat. The physical, chemical, and other properties of coal vary considerably from sample to sample.


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Science EncyclopediaScience & Philosophy: Cluster compound to Concupiscence