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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
nakresliť bridlica
Mining; Coal
Mäkké bridlice umiestnené nad niektoré uhoľných ložiskách, patrí po extrahovaní uhlia.
pevné uhlíka
Mining; Coal
Vľavo uhlíka v uhlie po všetok ostatný obsah prchavých materiál napálení. Sa používa ako odhad pre koľko koksu bude vyrobená.
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