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Fuel means materials which can be used to obtain energy for various purpose
fuels are many types..
coal is formed from dead remains of bio organism processed naturally under earth crust(main chemical component consist of carbon)
gas is naturally found earth eg:hydrogen
oil are in many form,mostlyused are organic of orgin they are also obtained as result of  procession of dead remains of bio organism due millions of years under earth crust eg: crude oil 

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