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Air Masses
Test Description: Characteristics of different air masses and air circulation patterns within high and low pressure system.
Instructions: Answer all questions to get your test result.
1) How does air circulate within a cyclone (low-pressure area) in the Northern Hemisphere?
A
counterclockwise and away from the center of the cyclone
B
clockwise and away from the center of the cyclone
C
counterclockwise and toward the center of the cyclone
D
clockwise and toward the center of the cyclone
2) 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 contains more water vapor than warm air does.
C
Cold air contains more dust than warm air does.
D
Cold air flows over warm air, causing the warm air to descend and cool.
3) In the Northern Hemisphere, the movement of air in a low-pressure center is
A
clockwise and toward the center
B
counterclockwise and away from the center
C
clockwise and away from the center
D
counterclockwise and toward the center
4) 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
mP and mT
B
cP and cA
C
cP and mT
D
cT and mP
5) Within a low-pressure system, the probability of precipitation is high because the air is generally
A
dry and rising
B
dry and sinking
C
moist and rising
D
moist and sinking
6) In the Northern Hemisphere, in which direction does surface wind circulate in a high-pressure air mass?
A
counterclockwise and toward the center
B
clockwise and toward the center
C
counterclockwise and away from the center
D
clockwise and away from the center
7) Which statement best explains why precipitation occurs at frontal boundaries?
A
Cold fronts move slower than warm fronts.
B
Cold fronts move faster than warm fronts.
C
Warm, moist air sinks when it meets cold dry air.
D
Warm, moist air rises when it meets cold, dry air.
8) The weather characteristics of air mass result primarily from its
A
rate of movement
B
geographic origin
C
direction of movement
D
size and shape
9) Which type of air mass would most likely have low humidity and high air temperature?
A
cP
B
mP
C
mT
D
cT
10) Which type of air mass usually contains the most moisture?
A
cT
B
mT
C
mP
D
cP
*select an answer for all questions
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