Changes

Four types of coal are:  

Four types of coal are:  

* Anthracite - the cleanest burning coal, found in such regions as south [[Wales]] and northeast [[Pennsylvania]].   

* [[Anthracite]] - the cleanest burning coal, found in such regions as south [[Wales]] and northeast [[Pennsylvania]].   

* Bituminous coal - widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite.

* Bituminous coal - widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite.