what is coal ????????..????????
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Coal is a solid organic material that is used as a fuel. Coal is very important as a major source of energy. 35% to 40% of the total energy used is obtained from coal it happens. Other combustible and useful substances are also obtained from coal.
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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. ... The resulting pressure and heat turned the plants into the substance we call coal.
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