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Coal as a source of energy and reasons why uses of coal has declined

Answer Text:
Coal as a source of energy
-A black or brown rock made of carbon.
-Mud, sand and other materials are deposited over vegetative matter such as tree trunks and branches.
-Deposited material prevents decomposition and also exerts pressure on it causing great heat.
-Peat layers are formed which gradually change into coal.
Usage of coal has declined due to:
1. Discovery of other forms of energy such as petroleum.
2. Exhaustion of old accessible mines.
3. High cost of mining coal.