Which of the following nuclear equations correctly describes alpha emission?
A) U ? Th + He
B) U ? U + He
C) U ? Pu + He
D) U ? He
E) none of the above
A
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If you were on a geology field trip in an area of glacial deposition, how would you distinguish between samples of till and stratified drift?
A) with a rock hammer B) by comparing their grain size and sorting C) by comparing the specific gravity of the two samples D) with hydrochloric acid
What percentage of Earth's water is freshwater?
A. 25% B. 85% C. 3% D. 50%
Upon what basis were the upper and lower boundaries of the Mesozoic Era defined?
A. the discovery that a meteoroid impact may have killed the dinosaurs B. dramatic changes in the color of the rocks from green to tan C. major episodes of mountain building D. abrupt changes in the types of fossils, representing mass extinctions
According to "Hubbert's peak," when will world peak oil production occur?
A. 2000 B. 1970 C. 1956 D. It won't peak until 2020