What is responsible for the large-scale global ocean circulation?
a. Surface currents
b. ENSO events
c. Thermohaline circulation
d. Langmuir circulation
ANS: C
Thermohaline circulation is the movement of water due to density differences. The whole ocean is
involved in this slow circulation. Information can be found in the section Thermohaline Circulation
Affects All the Ocean's Water.
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Magnetic domains normally occur in
A. iron. B. silver. C. copper. D. all of the above
Which nation in the region has made huge investments in the development of deep-water wells to extract fossil water?
A) Iraq B) Iran C) Saudi Arabia D) Libya E) Egypt
Why was Alfred Wegener's idea of continental drift dismissed?
A) Someone else had already introduced his idea to the scientific community. B) Many of his evidences did not support drifting continents. C) Continents have not moved since Earth was created. D) The evidence at the time seemed to suggest a solid mantle that did not allow drifting of continents to be possible.
In developed countries, the most recent increases in agricultural productivity have come from ________
A) extensive drip irrigation use in farming B) clearing grasslands and savannas C) clearing rainforests D) new crop varieties and polyculture techniques E) irrigation in arid areas