The circulation of water at great depths is driven by:
a. temperature only
b. density.
c. surface winds.
d. salinity only.
b
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Which of the following has been a result of the U.S. Clean Water Act?
A. spurred creation of new technology B. less CO2 in the atmosphere C. smaller percentage of streams safe for fishing D. less need for sewage treatment plants
What distinguishes a subarctic climate from a tundra climate?
What will be an ideal response?
Freshwater passing through uplifted sediments containing quick clay changes the sea salt content leaving quick clay with all but which of the following?
A. water contents commonly in excess of 50 percent B. grains mostly less than 0.002-mm diameter C. a higher salt content D. weak structure
Temperature inversions ____.
A. occur when a layer of cold air prevents warm air from rising B. make pollution problems worse C. last only a few minutes to a few hours D. cause cool air near the earth's surface to expand and rise, carrying pollutants higher into the troposphere E. help prevent air pollution