Question #db44e
1 Answer
Feb 11, 2018
Organic material in anaerobic conditions, and lots of pressure.
Explanation:
Detailed explanation and graphics are here:
http://www.coaleducation.org/q%26a/how_coal_formed.htm
https://c03.apogee.net/contentplayer/?coursetype=kids&utilityid=pseg&id=16200