CAEC Earth and Space Science 4

Question 1

Which layer of the atmosphere contains most weather and nearly all water vapour?

Accepted Answer

Troposphere

Answer

The troposphere is the lowest layer, where clouds and weather form.

Question 2

A cold front moves into a region of warm, moist air. What weather is most likely?

Accepted Answer

Thunderstorms and heavy rain followed by cooler temperatures

Answer

Dense cold air forces warm air upward rapidly, forming cumulonimbus clouds and storms.

Question 3

Why does Vancouver have milder winters than Winnipeg, even though they are at similar latitudes?

Accepted Answer

The Pacific Ocean moderates Vancouver's temperatures

Answer

Large bodies of water heat and cool slowly, keeping coastal climates moderate.

Question 4

Which gas is the most abundant greenhouse gas in Earth's atmosphere?

Accepted Answer

Water vapour

Answer

Water vapour is the most abundant greenhouse gas, though CO2 is the main driver of human-caused warming.

Question 5

Air pressure readings are falling steadily over several hours. What does this most likely indicate?

Accepted Answer

A low-pressure system with clouds and precipitation is approaching

Answer

Falling pressure signals rising air in a low, which often brings stormy weather.

(CAEC) Canadian Adult Education Credential Practice Test