Coal is composed of organic matter in the form of plant fragments. Coal can be:
* Lignite is black and has a crumbly consistency.
* Bituminous coal can be dull to shiny and black.
* Anthacite is usually considered metamorphic
Because of it's ability to burn we have been using coal as a fuel for generations. It made possible the industrial revolution and is still in use around the world today. While it is a cheap power source it creates pollution. Many people are looking for energy sources that are easier on our environment.