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Articles related to coal

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 ...
Coal - Sedimentary Rock Types - Geology - About.com
Coal is one of the major types of sedimentary rocks.
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. ...
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  ...
Anthracite Coal - Highest Ranked Coal in Short Supply - Energy
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 ...
Lignite / Brown Coal - Characteristics - Energy - About.com
Characteristics of lignite, also known as brown coal.
Using Coal in the Home - Geology - About.com
Americans don't burn coal at home any more, but it still works for much of the world.
Coal Geology - About.com
Coal: how it forms, where it's found, what it means to geologists.
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