Process of liquefaction and gasification results in a cleaner burning coal.
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Q37: Oil shale
A) Is rich in a tarry,
Q38: Oil extraction may cause
A) Black lung disease.
B)
Q39: Exploration techniques are now so efficient that
Q40: Canada's principal petroleum resources occur as
A) Oil.
B)
Q41: Once an oil spill occurs,it persists,virtually unchanged,for
Q43: One approach to cleaning up oil spills
Q44: Except for the problems of sulfur,coal,like oil
Q45: The Exxon Valdez oil spill provided a
Q46: If global warming destabilizes methane hydrates in
Q47: It is easier to estimate coal reserves
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