Ozone thinning is
A) greatest in the Northern Hemisphere in October.
B) greatest in the Southern Hemisphere in April.
C) evenly distributed for most of the year.
D) more pronounced in Antarctica than the Arctic.
D) more pronounced in Antarctica than the Arctic.
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A toy is pulled by three kids. Jim pulls with a force of 30 N north, Jill pulls with a force of 30 N south, and Jay pulls with a force of 15 N east. The resultant of these forces is
A. 15 N west. B. 15 N north. C. 15 N east. D. none of these
According to this graph, which shows water balance for the Ogallala aquifer, which of the following statements are true?
A) More water is taken out of the aquifer than is gained from recharge.
B) Less water is taken out of the aquifer than is gained from recharge.
C) Springs and rivers take out more water than does pumping.
D) As the aquifer dewaters, it expands, increasing the amount of pore space in which to store water.
This region of the United States has the lowest average number of tornadoes:
A) Midwest. B) West. C) Southeast. D) Northeast.
Trilobites were dominant during which geologic period?
A) Jurassic B) Permian C) Devonian D) Ordovician E) Cambrian