Coal is a combustible black or brownish-black sedimentary rock composed mostly of carbon and hydrocarbons. It is the most abundant fossil fuel produced in the United States.
The energy in coal comes from the energy stored by plants that lived hundreds of millions of years ago, when the Earth was partly covered with swampy forests.
Coal is a combustible black or brownish-black sedimentary rock usually
occurring in rock strata in layers or veins called coal beds or coal seams. The
Coal is a combustible black or brownish-black sedimentary rock with a high
amount of carbon and hydrocarbons. Coal is classified as a nonrenewable
Coal. Coal is the largest domestically produced source of energy in America and
is used to generate a significant chunk of our nation's electricity. The Energy ...
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Jun 10, 2016 ... Coal, solid, usually brown or black, carbon-rich material that most often occurs in
stratified sedimentary deposits. It is one of the most important ...
Coal is a variety of solid, combustible, sedimentary, organic rocks, formed from
vegetation that has been consolidated between other rock strata and altered by ...
Dec 27, 2016 ... Rising prices and demand will heighten the fight between coal and natural gas
for market share.
Fossil fuels — coal, natural gas, and oil — supply the vast majority of our energy
needs, including more than two-thirds of U.S. electricity generation. They have ...