Enforcement of Superfund and cleanup of polluted sites has slowed because
A. responsible parties have been quick in cleaning up pollution.
B. pollution is no longer a major concern for waste producing industries.
C. local governments and small businesses willingly take on the responsibility for cleanup.
D. the U.S. Congress refused to renew the tax on oil and chemical companies that funded the program.
E. most of the waste sites in the U.S. have already been cleaned up.
Answer: D
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When wolves in the Yellowstone area in Wyoming were eliminated, the population of elk exploded and the coyote willow shrubs were overgrazed. Which type of species did the wolf represent in this ecosystem?
A. keystone B. indicator C. invasive D. nonnative
The ____________________ ____________________ provides paleontologists with a unique look at the soft-bodied
organisms that thrived in the Middle Cambrian. Fill in the blank(s) with the appropriate word(s).
Which of the following is true about the geostrophic flow?
A) Pressure gradient force equals the Coriolis force. B) It occurs only in the upper atmosphere. C) Friction is not present. D) all of the above
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A) cooler; warmer B) warmer; cooler C) cooler; cooler D) warmer; warmer