Changes in local ocean salinity due to melting glaciers could alter the path and strength of the Gulf Stream
a. True
b. False
ANSWER: True
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An influx of foreign workers into the United Arab Emirates has had what demographic impact?
A) a rise in birth rates B) it has created an extraordinary gender imbalance C) a decrease in birth rates D) a rise in the elderly population E) a rise in birth rates and an extraordinary gender imbalance
To determine whether a celestial body is approaching or receding from Earth, astronomers employ ________
A) Einstein's equation B) the Stefan-Boltzmann law C) the Doppler principle D) telescopic imaging E) high speed radar
Air is often much cleaner after a rain primarily because
A) droplets and crystals scavenge particulates. B) particulates act as condensation nuclei. C) gravitational settling works faster when the air is saturated. D) the lower temperature increases the efficiency of automobile engines.
Jet streams:
A) are usually about ten miles wide. B) were first detected by George Hadley. C) occur about 2-12 kim above the surface in middle latitudes. D) reverse direction 180 degrees in summer. E) do not go below 50 degrees latitude.