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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.
Contributors in 石炭
Coal
ない。 5されず、。再販製品を意志のリファイナーまたは他のディーラーに販売6燃料油
エネルギー; 石炭
号のすべてのボリュームが含まれています5号究極の消費者に製品の再販の意図との貿易やビジネスが購入した6燃料油。