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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
Characteristics of anthracite coal, the highest ranked coal for heat content.
http://energy.about.com/od/Coal/a/Anthracite-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
Coal Geology - About.com
Coal: how it forms, where it's found, what it means to geologists.
http://geology.about.com/od/coal/
Sub-Bituminous Coal Characteristics - About.com Energy Site
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
Culm Fire in Coal Country - Geology - About.com
An antique postcard depicts a burning pile of waste coal, or culm.
http://geology.about.com/library/bl/images/blculmfire.htm
Lignite / Brown Coal - Characteristics - About.com Energy Site
Sometimes called “brown coal,” lignite is the lowest quality and most crumbly coal. This softer and geologically “younger” coal sits relatively close to the earth's  ...
http://energy.about.com/od/Coal/a/Lignite.htm
Using Coal in the Home - Geology - About.com
When I was a kid in the mid-1960s, we moved to a house that had a pile of coal in the cellar—lump coal, nice big chunks with a clean cleavage and little dust.
http://geology.about.com/od/coal/a/aacoalathome.htm
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