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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 석탄
Coal
면제 도매 생성기 (EWG)
에너지; 석탄
1935 년의 공공 유틸리티 지주 회사 법에 규정 된 특정 재정 및 법적인 금지에서 면제 되 다 1992 에너지 정책 법에 따라 만든 발전기 도매.