How did geologic events play a role in forming coal?

1 answer

Check these sites.

http://www.classzone.com/books/earth_science/terc/content/visualizations/es0701/es0701page01.cfm?chapter_no=visualization

http://lincoln.midcoast.com/~wps/3ripley9899/spinning.htm

http://www.ket.org/Trips/Coal/AGSMM/agsmmhow.html