ES Topic 2 Lesson 3

When a warm air mass is caught between two cold fronts, the result is what type of front?

• Warm

• Cold

• Stationary

• Occluded

When a large, fast, cold air mass runs into a warm air mass, the result is what type of front?

• Cold

• Warm

• Occluded

• Stationary

When a fast-moving warm air mass overtakes a slower-moving cold air mass, the result is what type of front?

• Cold

• Warm

• Stationary

• Occluded

When a warm air mass runs into a cold air mass but neither one can move the other, the result is what type of front?

• Cold

• Warm

• Stationary

• Occluded

What are the major causes for moving air masses in North America?

• Prevailing westerlies, humidity

• Low temperatures, jet streams

• Jet stream, prevailing westerlies

• Changing humidity, dew points

Warm, tropical air masses have what type of air pressure?

• Low

• High

• Medium

• Zero

Cold, polar air masses have what type of air pressure?

• Zero

• Medium

• High

• Low

Continental air masses usually form over:

• Land

• Sea

• Polar regions

• Antarctica

Westerlies can best be described as:

• Blowing usually or most frequently from a given direction

• Air masses are cold, dry, and stable. These air masses originate over northern Canada and Alaska

• Air masses formed over the ocean and are very humid

• A wind blowing from the west. Push air masses from west to east.

Maritime polar can best be described as:

• Air masses are cold, dry, and stable. These air masses originate over northern Canada and Alaska

• A swirling center of low air pressure that spin counterclockwise

• Air masses are hot and dry. Their air is carried from Mexico and the southwestern U.S.

• Air masses formed over the ocean and are very humid