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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?

Acounterclockwise and away from the center of the cyclone Bclockwise and away from the center of the cyclone Ccounterclockwise and toward the center of the cyclone Dclockwise and toward the center of the cyclone

2) Why do clouds usually form at the leading edge of a cold airmass?

ACold air flows under warm air, causing the warm air to rise and cool. BCold air flows over warm air, causing the warm air to descend and cool. CCold air contains more water vapor than warm air does. DCold air contains more dust than warm air does.

3) In the Northern Hemisphere, the movement of air in a low-pressure center is

Aclockwise and away from the center Bcounterclockwise and away from the center Ccounterclockwise and toward the center Dclockwise 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?

AmP and mT BcP and cA CcP and mT DcT and mP

5) Within a low-pressure system, the probability of precipitation is high because the air is generally

Amoist and sinking Bmoist and rising Cdry and rising Ddry and sinking

6) In the Northern Hemisphere, in which direction does surface wind circulate in a high-pressure air mass?

Aclockwise and away from the center Bclockwise and toward the center Ccounterclockwise and toward the center Dcounterclockwise and away from the center

7) Which statement best explains why precipitation occurs at frontal boundaries?

AWarm, moist air sinks when it meets cold dry air. BWarm, moist air rises when it meets cold, dry air. CCold fronts move slower than warm fronts. DCold fronts move faster than warm fronts.

8) The weather characteristics of air mass result primarily from its

Ageographic origin Bdirection of movement Csize and shape Drate of movement

9) Which type of air mass would most likely have low humidity and high air temperature?

AcP BcT CmT DmP

10) Which type of air mass usually contains the most moisture?

AmT BmP CcP DcT

*select an answer for all questions

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