Which statement about mercury is true?
A. Mercury is found only in the atmosphere.
B. Mercury slowly breaks down and degrades in the environment.
C. At high doses, Mercury is a neurotoxin.
D. Only two states have issued warnings about the mercury content of fish.
E. The EPA has issued concerns about mercury, but the UNEP has not.
Answer: C
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Which environmental impact would not be a result of placer mining?
A) contamination of underground aquifers. B) smothering aquatic life. C) clogging streams with silt. D) destroying streambed habitats. E) introducing toxic compounds to streams
Since 1980, Arctic sea ice has ____.
A. decreased in volume and surface area B. decreased in volume but not changed in surface area C. increased in volume and surface area D. not changed in volume or surface area E. not changed in volume, but decreased in surface area
Soil creep
A. is more of a hazard to property than to lives. B. commonly triggers snow avalanches because it makes overlying snow unstable. C. cannot be recognized or detected because it is such a slow process. D. All of the choices are correct.
What is the behavior of the Ekman spiral? What occurs when the friction depth is reached? What will be an ideal response?