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What is carbonization ?
Coal was formed in prehistoric times when huge forest areas got 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 biochemical process extending over millions of years is called carbonisation .


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