Sometimes, the vegetation is preserved in the coal seam, making coal perhaps the most "fossil-y" of fossil fuels. Here, a group of coal miners crowd around a petrified tree stump in 1918.

Photograph by J. Horgan, Jr.

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coal Encyclopedic Entry

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8 - 12 and up

Cross-Disciplinary, Science, Geography, Social Studies, Informal Education

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Coal is a non-renewable fossil fuel that is combusted and used to generate electricity. Mining techniques and combustion are both dangerous to miners and hazardous to the environment; however, coal accounts for about half of the electricity generation in the United States.