Fossil fuels are sources of energy that have developed within the earth over millions of years. Because fossil fuels - oil, natural gas, and coal -...
Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal
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Coal, oil and gas are called "fossil fuels" because they have been formed from the organic remains of prehistoric plants and animals. Find out more about how they formed at: