| Coal is a non-renewable fossil fuel. Coal is black or brownish-black sedimentary rock made mostly of carbon and hydrocarbons. It is the most abundant fossil fuel produced in the United States and is mined in 27 states. The energy in coal comes from the energy stored by plants that lived hundreds of millions of years ago. For millions of years a layer of dead plants was covered by layers of water and dirt, trapping the energy of the dead plants. The heat and pressure from the top layers turned the plant remains into coal. |
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