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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 ...
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 ...
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. ...
Anthracite Coal - Highest Ranked Coal in Short Supply
Characteristics of anthracite coal, the highest ranked coal for heat content.
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 ...
Coal Geology - About.com
Coal: how it forms, where it's found, what it means to geologists.
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  ...
Culm Fire in Coal Country - Geology - About.com
An antique postcard depicts a burning pile of waste coal, or culm.
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  ...
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.
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