The formation of a mesocyclone requires
A) vertical wind shear.
B) the existence of a wall cloud.
C) the presence of stratocumulus clouds.
D) the presence of a funnel cloud.
Answer: A
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The rotation direction of the surface current at the northern hemisphere is the opposite of that at the southern hemisphere. This discrepancy is due to:
a. the thermohaline circulation b. the gravitational forces of the Sun-Moon system c. the Coriolis Effect d. the centrifugal force of the Earth-Moon system
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.
In the tropical savanna climate, most of the rain falls:
a. in the low-sun season. b. throughout the year. c. in the high-sun season. d. due to orographic uplift.
Which marine ecosystem has the lowest average net primary productivity?
A) Algae beds and coral reefs B) Estuaries C) Freshwater swamp and marsh D) Open Ocean E) Upwelling zone