Coal is a combustible sedimentary rock that has been generated over millions of years as a result of the transformation of organic matter, mostly plant matter, under the influence of heat and pressure. It is typically black or brownish-black in color.
It is typically black or brownish-black in color. The main source of energy used to produce pow...
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Close-up of blast at a coal mine in South Africa. Can you say overcharged?Eugene Preis
