TeachMeFinance.com - explain Coal
Coal The term 'Coal' as it applies to the area of energy can be defined as ' A readily combustible black or brownish-black rock whose composition, including inherent moisture, consists of more than 50 percent by weight and more than 70 percent by volume of carbonaceous material. It is formed from plant remains that have been compacted, hardened, chemically altered, and metamorphosed by heat and pressure over geologic time'.
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