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Coal

Coal is a fossil fuel extracted from the ground by underground mining or open-pit mining (strip mining).

It is a readily combustible black or brownish-black sedimentary rock.

Often associated with the Industrial Revolution, coal remains an enormously important fuel and is the largest single source of electricity world-wide.

In the United States, for example, the burning of coal generates 50% of the electricity consumed.

Note:   The above text is excerpted from the Wikipedia article "Coal", which has been released under the GNU Free Documentation License.
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May 27, 2015

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