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OpenStudy (anonymous):

The United States contains about ________ of the world’s coal reserves. a. 75% c. 50% b. 5% d. 25%

OpenStudy (micahm):

en.wikipedia.org/wiki/Coal-mining_region

OpenStudy (micahm):

Coal. What is the future of coal? Nov. 13 2012 2:17 PM ... Much of the world's coal dates back to the Carboniferous Period, some 318 million years ago, and contains plant matter and fossils ... And the United States is naturally well-endowed with coal resources—25 percent of the world's coal reserves are within our borders.

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