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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: Energie
Adăugare termen nouContributors in Cărbune
Coal
noroi capac
Minerit; Cărbune
Folosit pentru a descrie un exploziv care a fost acoperit de noroi sau un material similar şi este în contact cu roca.
îmbucătură
Minerit; Cărbune
O porţiune de o mină care a fost deja excavate şi acum este umplut cu deşeuri.