Sub-bituminous coal
Sub-bituminous coal
Lower grade of coal that contains 35–45% carbon.
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Readers' pathsAug 2026 – Oct 2026
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Bituminous coal
Collective term for higher-quality coal.
35%
Lignite
Soft, brown, combustible, sedimentary rock.
25%
Coal
Combustible sedimentary rock composed primarily of carbon.
20%
Powder River Basin
Geologic structural basin in the western US.
9.2%
Anthracite
Hard, compact variety of coal.
6.5%
Fossil fuel power station
Facility that burns fossil fuels to produce electricity.
2.2%
Readers come from
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Bituminous coal
Collective term for higher-quality coal.
32%
Coal
Combustible sedimentary rock composed primarily of carbon.
23%
J. H. Campbell Generating Plant
Coal-fired power station in Michigan.
4.7%
Semirara Island
Island in Antique, Philippines.
3%
Powder River Basin
Geologic structural basin in the western US.
2.9%
Four Corners Generating Station
American coal-fired power plant.
2.6%
Cholla Power Plant
Coal power plant in Navajo County, Arizona.
0.68%