Coal is still an important fuel in the United States, mainly used for producing electricity today.
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Q43: Aluminum laterite is also known as the
Q44: Nonmetallic minerals used for abrasives include _.
A)topaz
Q45: The use of renewable energy has been
Q46: A cap rock is a porous, permeable
Q47: Black smokers are results of hydrothermal activity
Q49: Cap rocks over reservoirs of petroleum and
Q50: Deeply weathered tropical soils that develop in
Q51: Coal forms from ancient plant remains originally
Q52: A mineral deposit may lose its profitability
Q53: What is the definition of a placer
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