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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
財務会計基準審議会(FASB)
エネルギー; 石炭
責任ある独立したボード、1973年以来、一般会計原則を確立するための。その公式宣言財務会計基準の「財務会計基準書」および「解釈」と呼ばれる。 ...