On this map of the south Atlantic, why is the mid-ocean ridge in the center of the ocean?
A. Seafloor is added to both sides during seafloor spreading.
B. Subduction has occurred under one and then another of the adjacent continents.
C. Seafloor spreading has stopped in this area.
D. Subduction is consuming seafloor beneath both adjacent continents.
Answer: A
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The fastest seismic wave is a
A. primary wave. B. tertiary wave. C. Rayleigh wave. D. secondary wave.
While the U.S. command-and-control environmental regulations initiated in the 1970s have been very effective at reducing pollution, some economists have difficulty with the legislation because
A. it often requires different pollution-control technology for each polluter. B. it usually requires different standards for all current and potential polluters. C. it is full of fine print and exceptions, and costly for some firms to comply with. D. it is not subject to compromises in the political process and all of the above.
Contamination of groundwater by natural and anthropogenic sources of ____ is a global problem that has resulted in hundreds of thousands of premature deaths.
A. arsenic B. cadmium C. lead D. magnesium E. manganese
Find the largest cold front located on the map. The likely air mass to the west of the cold front is a ________ mass that is likely to be ________ than the air mass to the east.
A) mT; moister
B) mP; moister
C) cP; drier
D) cP; moister