Types of Coal: Peat, Lignite, Bituminous Coal Anthracite Coal .
WEBJan 25, 2016 · The surface of the earth changed and water and dirt washed in, stopping the decaying process. More plants grew up, but they too died and fell, forming separate layers. After millions of years many layers had formed, one on top of the other. ... Bituminous Coal. Soft coal; most widely available and used coal. Derives its name after a liquid ...