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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 ...
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  ...
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 ...
Anthracite Coal - Highest Ranked Coal in Short Supply
Characteristics of anthracite coal, the highest ranked coal for heat content.
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. ...
Coal Geology - About.com
Coal: how it forms, where it's found, what it means to geologists.
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 ...
Psoriasis Coal Tar Treatment Products - About.com
Jun 25, 2014 ... Coal Tar products have been used for the treatment of psoriasis and other skin diseases for over a century. They are the original ...
Lignite / Brown Coal - Characteristics - About.com Energy Site
Characteristics of lignite, also known as brown coal.
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,  ...
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