how did a coal become a resource from an ordinary stone
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In past coal is only the fossil fuel.
in current the need of coal started and people research about coal that it is found in the crust and it became a natural resource.
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Explanation:
Coal: A Complex Natural Resource. Coal is abundant in the U.S., is relatively inexpensive, and is an excellent source of energy and byproduct raw materials. Because of these factors, domestic coal is the primary source of fuel for electric power plants in the U.S., and will continue to be well into the 21st century.
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