Coal By Emma, Pernille and Ak.

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Fossil fuel used primarily for electricity generation in the United States.
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Presentation transcript:

Coal By Emma, Pernille and Ak

Basics Consists primarily of carbon Secondarily of hydrogen, sulfur, oxygen and nitrogen. Provides half of the world‘s electricity Coal-use has tripled since 1960

How coal was formed Dead plant submerged in swamp-environments Under heat and pressure plants convert to lignite Lignite converts into coal It takes hundreds of millions of years for coal to form

How coal is mined Modern surface mining Seams near surface Requires few workers Uses large machinery Covers large areas Remove vegetation and soil from area Sediment of rock is removed Coal removed in strips Restoration after mining process

Mountaintop-removal mining Removal of mountaintop to reach coal seams Coal is pushed down from the mountaintop Leaves the mountains flat Unpopular

Underground mining Room and pillar Longwall 50% of underground mining Long tunnels Support-system for roof when mining

Energy crisis Coal is cheap But… Pollution Accidents Climate change Technology evolves Debate: Coal or…

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