Check out this description: http://en.wikipedia.org/wiki/Coal
A rock made up of carbon, oxygen, hydrogen and nitrogen. It is what remains of trees, plants, mosses and other vegetation which once grew on the earth's surface and were afterwards covered by layers of other rocks. Great pressure and chemical changes, lasting for hundreds of thousands of years, gradually drove out the larger part of the gases, so that coal, as we now know it, is mostly carbon, squeezed into a hard, compact form.
by dashingscorpio22 months ago
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