* not completed

. Which statement about air masses is true?

Warm air masses form more quickly than cold air masses. correct incorrect

Air masses form in one to two days. correct incorrect

Cold air masses begin to form when cold air moves over a warmer surface. correct incorrect

Air over colder high-latitude oceans will become moister than air over warm tropical oceans. correct incorrect

* not completed

. Which of the following are characteristics of a maritime tropical air mass?

Cold and dry correct incorrect

Hot and dry correct incorrect

Warm and moist correct incorrect

Cool and moist correct incorrect

* not completed

. Which air mass would be responsible for causing a large temperature drop in Ontario in winter?

mP correct incorrect

mT correct incorrect

cT correct incorrect

cP correct incorrect

* not completed

. Which of the following areas would NOT be a good air-mass source region?

Gulf of Mexico correct incorrect

Nunavut correct incorrect

North Pacific Ocean correct incorrect

Ontario correct incorrect

* not completed

. Which statement about air masses is false?

cP air masses can cause lake effect snows downwind of the Great Lakes. correct incorrect

mP air masses are more common on the east coast of Canada than the west coast. correct incorrect

Convective precipitation can occur in summer within cP air masses. correct incorrect

cA air masses only occur in winter. correct incorrect

* not completed

. What would you NOT expect to occur as a front is passing your area?

A change in dew-point temperature correct incorrect

Clouds and precipitation correct incorrect

An increase in pressure correct incorrect

A shift in wind direction correct incorrect

* not completed

. What frequently develops in the south-central United States in spring and summer?

Pineapple express correct incorrect

Dry line correct incorrect

mP air mass correct incorrect

Siberian express correct incorrect

* not completed

. Which front is drawn on a weather map in two different colours?

Cold correct incorrect

Warm correct incorrect

Stationary correct incorrect

Occluded correct incorrect

* not completed

. What category of clouds is common just before a warm front passes overhead?

Altostratus correct incorrect

Cirrus correct incorrect

Nimbostratus correct incorrect

Cirrostratus correct incorrect

* not completed

. A process that gradually separates the centre of low pressure from the warm air in a mid-latitude cyclone is known as what?

Frontogenesis correct incorrect

Occlusion correct incorrect

Frontolysis correct incorrect

TROWAL correct incorrect

* not completed

. Good air-mass source regions are the regions associated with the large, semi-permanent anticyclones of the general circulation.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. If the third letter of an air mass symbol is k it means the air mass is colder than the surface below.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Frontolysis can occur with surface convergence.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. The steepest part of the slope of a frontal surface is in the air layer closest to Earth's surface.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. In a warm-type occlusion, air behind the cold front pushes under air ahead of the warm front.

TRUE correct incorrect

FALSE correct incorrect