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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
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Coal
acru-picior
Energie; Cărbune
Volumul de apă, care este necesar pentru a acoperi o suprafaţă de 1 hectar la o adâncime de 1 picior.
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Plantarea de păduri noi pe terenurile care nu au fost recent împădurite.
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