Environment 11-13, 16 Test

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energy sources
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Terms in this set (13)
surface mining-used to obtain approximately 60% of the coal mined in the U.S. -30m or so of the surface -first removes soil, subsoil, then rock stratastrip mining-a trench dug to extract coal -coal is scraped out of the ground and loaded into railroad cars or trucks -then a new trench is dug parallel to the old one and the overburden from the new trench is put into the old trench; creating a spoil bank,a hill of loose rocksubsurface mining-obtains 40% of the coal mined in the U.S. -coal is deeper in the ground or runs deeps into the ground from an outcrop on a hillside -mined from underground -advantages(over surface mining); less expensive, safer for miners, and generally allows for a more complete removal of coal from the ground -disadvantages; disturbs the lan