How Does Coal Form?

Answer

Coal forms after plant materials are buried under sediments. Over years the materials become compacted. Heat and pressure eventually turn the material to coal. You can find more information here: http://www.classzone.com/books/earth_science/terc/content/visualizations/es0701/es0701page01.cfm?chapter_no=07
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1 Additional Answer
Coal comes from a process called coalification. During this process peat which is plant parts, roots, bark, spores and other things decay. The peat becomes compact and buried by sediment. This is the first step to coal formation. You can find more information here: http://www.minepermits.ky.gov/miningeducation/coal_formation.htm
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