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Articles related to coal

Chemical Spills: What is Coal Ash?
A by-product of coal combustion, coal ash sometimes enters our air and water, and causes environmental damage.
http://environment.about.com/od/pollution/fl/Chemical-Spills-What-is-Coal-Ash.htm
Clean Coal and Liquid Coal - Is Clean Coal Really Clean?
Clean coal supporters claim clean coal and liquid coal can help to free the United States of its dependence on foreign oil without damaging the environment, but ...
http://environment.about.com/od/fossilfuels/a/clean_coal.htm
Coal - Sedimentary Rock Types - Geology - About.com
Coal is fossilized peat, dead plant material that once piled deep on the bottom of ancient swamps. Learn more about coal in Coal in a Nutshell and Coal ...
http://geology.about.com/od/rocks/ig/sedrockindex/rocpiccoal.htm
Coal in a Nutshell - Geology - About.com
Like petroleum, coal is an enormously valuable mineral resource, used for hundreds of years in industry. And also like petroleum, the Web has lots of information ...
http://geology.about.com/od/mineral_resources/a/aa_nutshellcoal.htm
Bituminous Coal Characteristics and Applications
Bituminous coal is the most common coal. Bituminous and sub-bituminous coal together represent more than 90 percent of all the coal consumed in the U.S. ...
http://energy.about.com/od/Coal/a/Bituminous-Coal.htm
Anthracite Coal - Highest Ranked Coal in Short Supply - Energy
Characteristics of anthracite coal, the highest ranked coal for heat content.
http://energy.about.com/od/Coal/a/Anthracite-Coal.htm
Sub-Bituminous Coal Characteristics - Energy - About.com
Sub-bituminous coal is considered a black coal, although its appearance varies from bright black to dull dark brown. Its consistency ranges from hard and strong  ...
http://energy.about.com/od/Coal/a/Sub-Bituminous-Coal.htm
Coal Varieties - Composition, Global Usage, Energy Value
Coal is a sedimentary black or dark brown rock that varies in composition. Some types of coal burn hotter and cleaner, while others contain high moisture ...
http://energy.about.com/od/Coal/a/All-Coal-Is-Not-Created-Equal.htm
Lignite / Brown Coal - Characteristics - Energy - About.com
Characteristics of lignite, also known as brown coal.
http://energy.about.com/od/Coal/a/Lignite.htm
China: Number 1 Coal Fire Hotspot - Mining - About.com
There are eight to ten regions on earth where significant coal and peat fires can be found. China is definitely number 1. This ranking has been based on the size,  ...
http://mining.about.com/od/Coal/a/China-Number-1-Coal-Fire-Hotspot.htm
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