Chapter 20 Review

An air mass is a large body of air with uniform temperature and

• uniform moisture

• uniform thickness

• low pressure throughout

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Which air masses influence much of the weather in North America, especially east of the Rockies?

• maritime tropical and continental polar

• continental polar and continental tropical

• maritime polar and maritime tropical

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What causes most of the precipitation in the eastern two-thirds of the United States?

• maritime polar air masses

• continental polar air masses

• maritime tropical air masses

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Continental tropical air masses centered over northern Mexico have little influence on weather in the United States because they

• are too high in altitude

• rarely move outside their source region

• never influence weather

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Air mass changes

• the weather of the area over which it moves

• the elevation of underlying areas

• the rotation direction of cycles

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What forms at the boundary between two different air masses?

• a temperature inversion

• a front

• a storm surge

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A warm front forms when...

• cold air moves up over warmer air

• warm air glides up over colder air

• the temperature in a warm air mass increases

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Air masses are classified according to the...

• direction in which they move

• speed of their movement

• surface over which they form

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Which of the following characteristics is NOT true of cold fronts?

• Violent weather such as thunderstorms occurs along them.

• The temperature drops as they pass.

• They move more slowly than warm fronts.

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What happens along a stationary front?

• cold air rises over warm air

• The flow of air is neither toward the warm air mass nor toward the cold air mass.

• Wind stops completely.

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