Piles of waste soil and rock removed during surface mining are called ____.
A. hazardous waste
B. gangues
C. spoils
D. tailings
E. smelts
Answer: C
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A. higher than it is now B. the same as it is now C. much more variable than it is now D. lower than at it is now
A gas under constant pressure will ________ when ________.
A. keep the same volume; heated or cooled B. expand; heated C. expand; cooled D. contract; heated
What percentage of Brazil's motor vehicles currently run on ethanol or ethanol-gasoline mixtures?
A. 5% B. 15% C. 30% D. 45% E. 75%
A volcanic breccia texture indicates that
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