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Petroleum, also called crude oil, is a fossil fuel. Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria. Coal, natural gas, and petroleum are all fossil fuels that formed under similar conditions. ...
Natural coal is formed due to the burial of plants and animals. Petroleum and natural gas are a result of the buried marine life. Fossil fuels are mainly made up of Hydrocarbons.