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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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
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A. iron. B. silver. C. copper. D. all of the above
Why was Alfred Wegener's idea of continental drift dismissed?
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