what is Coal?
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Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons
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Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests
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