Air Masses: Question Preview (ID: 18)


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How does air circulate within a cyclone (low-pressure area) in the Northern Hemisphere?
a) counterclockwise and toward the center of the cyclone b) counterclockwise and away from the center of the cyclone c) clockwise and toward the center of the cyclone d) clockwise and away from the center of the cyclone
Why do clouds usually form at the leading edge of a cold airmass?
a) Cold air flows under warm air, causing the warm air to rise and cool. b) Cold air flows over warm air, causing the warm air to descend and cool. c) Cold air contains more dust than warm air does. d) Cold air contains more water vapor than warm air does.
In the Northern Hemisphere, the movement of air in a low-pressure center is
a) counterclockwise and toward the center b) counterclockwise and away from the center c) clockwise and away from the center d) clockwise and toward the center
Tornadoes occur when a very cold, dry air mass meets a very warm, wet air mass. Which two air masses would most likely form a tornado when they meet?
a) cP and mT b) mP and mT c) cT and mP d) cP and cA
Within a low-pressure system, the probability of precipitation is high because the air is generally
a) moist and rising b) moist and sinking c) dry and sinking d) dry and rising
In the Northern Hemisphere, in which direction does surface wind circulate in a high-pressure air mass?
a) clockwise and away from the center b) clockwise and toward the center c) counterclockwise and toward the center d) counterclockwise and away from the center
Which statement best explains why precipitation occurs at frontal boundaries?
a) Warm, moist air rises when it meets cold, dry air. b) Warm, moist air sinks when it meets cold dry air. c) Cold fronts move faster than warm fronts. d) Cold fronts move slower than warm fronts.
The weather characteristics of air mass result primarily from its
a) geographic origin b) size and shape c) rate of movement d) direction of movement
Which type of air mass would most likely have low humidity and high air temperature?
a) cT b) cP c) mT d) mP
Which type of air mass usually contains the most moisture?
a) mT b) mP c) cT d) cP
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