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 ...
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Black coal - definition of Black coal by The Free Dictionary Black coal synonyms, Black, a combustible compact black or dark-brown carbonaceous rock formed from compaction of layers, brittle chunks of shiny black coal, Read ...
Coal - Simple English Wikipedia, the free encyclopedia Coal is a black rock, and a solid fossil fuel. It is usually very hard. Coal is made of 65%–95% carbon. ... Carbon - Wikipedia, the free encyclopedia Characteristics ·
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COAL INFORMATION (2012 edition) - 7 2. PRODUCT DEFINITIONS Coal Coal is a family name for a variety of solid organic fuels and refers to a whole range of combustible sedimentary rock materials spanning a continuous quality ...
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