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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.
Especialidad: Energía
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Coal
techo segundario
Minería; Carbón
El techo encima del carbono que debe ser apoyado durante la excavacion del carbono.
van de transporte
Minería; Carbón
Un vehiculo utilizado para transportar carbono o maquinas de minas a un otro lugar.
Glosarios destacados
HOSEOKNAM
0
Términos
42
Blosarios
11
Seguidores
Wind energy company of China
dnatalia
0
Términos
60
Blosarios
2
Seguidores