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what is carbonisation?
Millions of years ago when huge forests areas got buried under the surface of the earth. Under the humid and hot conditions ,they were attacked by anaerobic bacteria which progressively removed hydrogen and oxygen ,leaving behind carbon .Due to very high temperature and pressure of the earth ,the carbon got compact to form stony residues, called coal .Some amount of methane was also formed due to action of anaerobic bacteria ,which was trapped in the coal .The slow conversion of wood into coal by a boichemical process extending over millions of years is called carbonisation .


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