Changes

'''Coal''' is a combustible material which was formed by decomposing plant and animal material placed under intense pressure. Some [[young earth creationists]] believe that this pressure was caused by the [[Great Flood]] <ref>http://www.christiancourier.com/articles/read/the_record_buried_in_coal</ref>.  

'''Coal''' is a combustible material which was formed by decomposing plant and animal material placed under intense pressure.

Recent finds such as the world's largest fossil forest in the [[Illinois]] Herrin coal bed, a 6-foot-thick strip mined by a subsidiary of Peabody Coal, would seem to cast doubt on this theory, as two other actively mined Illinois coal seams, the Danville and the Springfield, which sit above and below the Herrin, respectively, appear to be separated by about a half-million years of geological time. <ref>http://www.stltoday.com/stltoday/news/stories.nsf/sciencemedicine/story/6E9003B041B59699862572C7000F4E02?OpenDocument</ref>

The [[mining]] of coal as a [[fuel]] sparked the [[Industrial Revolution]], as coal was used to power [[factory|factories]] and [[railway]]s, first through the generation of steam, and later when coal became one of several methods of generating [[electricity]].

The [[mining]] of coal as a [[fuel]] sparked the [[Industrial Revolution]], as coal was used to power [[factory|factories]] and [[railroad]]s, first through the generation of steam, and later when coal became one of several methods of generating [[electricity]].

== Types of coal ==

Four types of coal are:  

Four types of coal are:  

[[Graphite]], used in [[pencil]]s and as an electrical conductor, is technically a type of coal of an even higher grade than anthracite, but is not used as a fuel as it is hard to ignite.

[[Graphite]], used in [[pencil]]s and as an electrical conductor, is technically a type of coal of an even higher grade than anthracite, but is not used as a fuel as it is hard to ignite.

==References==

==References==

<references/>

<references/>

[[category:energy]]

[[category:energy]]