We can say that there are three types of fossil fuels that are most widely used for different purposes, including coal, oil or petroleum and natural gas. Coal is one such source of energy, which has been in use for centuries and is abundantly found on the earth. Presently, coal is used in industries for the production of iron, steel, cement, paper, etc. It is also used in power plants for generating electricity.
Oil comes second in terms of popularity. Crude oil undergoes some processing before it...
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