Question

how is wood converted into coal inside the earth. ​

Answer 1

Answer:

Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.

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Answer 2

Answer:

Coal was formed by the anaerobic thermal degradation of the cellulosic material of big plants/ trees which got buried inside the earth millions years ago. ... The slow conversion of wood into the coal under the influence of high temperature, high pressure and in the absence of air, is termed as carbonization.