Which of the following characterizes stationary fronts?
A. They are often associated with cloud cover.
B. They occur within a single air mass.
C. They occur when two cold fronts meet.
D. They move at the same speed as cold fronts.
Answer: A
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The biggest environmental problem associated with hydropower projects like the Three Gorges Dam are to the atmosphere—acid rain and global warming
Indicate whether this statement is true or false.
Which of the following is a key part of the formation of most natural bridges?
A. folding of soft rock layers B. stream erosion C. spheroidal weathering D. volcanic eruptions E. None of these choices are correct.
To encourage the development of sustainable agriculture, U.S. national agricultural policies will need to support all of the following, except
A) incorporating economic externalities such as soil degradation, pollution, and overuse of water supplies. B) more job creation in agriculture. C) continued support and subsidy of large monoculture farms. D) support of urban and organic agriculture.
Since the 1980s, the United States has
A) increased its oil discoveries and production and today imports about 50% of its oil. B) seen its oil production keep pace with consumption. C) been steadily consuming more oil and producing less. D) improved the efficiency of its technology and now imports no foreign oil.