Air Masses

Which direction do the prevailing westerlies blow?

• North

• East

• South

• West

What is the significance of the permafrost line?

• It changes locations depending on the season.

• It separates Arctic air masses and Polar air masses.

• It remains frozen regardless of the air mass residing above it.

• It only forms in the arctic where both land and water remain frozen.

Maritime arctic air passing through Canada is formed in...

• Russia

• The Yukon

• Greenland

• The North Pole

Maritime air masses are...

• Cold

• Warm

• Dry

• Moist

As a Cold Moist air flows from the Pacific to Alberta, it is raised orographically over the Rocky Mountains and pushed down towards the prairies. The air mass modifies by

• losing moisture through precipitation and gaining in temperature by being pushed down the Rockies.

• losing moisture through movement over dry ground and losing temperature by being pushed down the Rockies.

• Gaining moisture as the temperature of the air increases.

• Losing moisture as the temperature of the air decreases.

What causes the heavy snowfall of lake effect?

• Continental Arctic air interacts with evaporating water from the lakes, saturating the air mass above.

• Maritime Arctic air interacts with evaporating water from the lakes, further saturating the already moist air.

• Continental Maritime air forms through the transformation of dry air into cold moist air as it passes over the lakes.

• Maritime polar air forms through the transformation of cold moist air into very cold very moist air as it passes over the lakes.

Which of the following is the most stable of air masses?

• Continental Arctic

• Continental Polar

• Maritime Arctic

• Continental Polar

Which of the following will most likely transform into a new type of air mass? (Select all correct responses)

• Cold, moist air from an ocean passes over mountains.

• Cool, dry air is quickly pushed past a large lake.

• Warm, dry air from the prairies is slowly pushed over a cold pond.

• Warm, moist air from an ocean passes over a snow covered coastline.

Which of the following is a characteristic of cold air mass movement.

• Smooth Air

• Stratiform Clouds

• Drizzle

• Good Visibility

Which of the following would least likely be found in Canada

• Continental Tropical

• Maritime Tropical

• Continental Arctic

• Maritime Polar