Ozone thinning is

A. greatest in the Northern Hemisphere in October.
B. evenly distributed for most of the year.
C. greatest in the Southern Hemisphere in April.
D. more pronounced in Antarctica than the Arctic.


Answer: D

Environmental & Atmospheric Sciences

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A. south B. east C. north D. west

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One of Edwin Hubble's discoveries is that the known universe is expanding. This means that

A) most all observable galaxies are moving away from each other. B) light rays bend as they near the event horizon of a black hole. C) light rays undergo acceleration as they travel vast distances. D) the mass of the universe is slowly dissipating.

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Saying that the ocean is buffered means that it: a. can't get too acidic or too alkaline

b. is alkaline. c. is neutral. d. is acidic.

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A risk is

A. something that is always to be avoided. B. involves a biological or chemical hazard. C. a lifestyle choice. D. the probability of suffering harm from a hazard E. is inherently transmissible.

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