Convection Currents, Air Masses and Fronts

Where does the moisture in an air mass come from?

• Rain

• Fog

• Evaporation

• Cool air

Why are some air masses cold?

• They form on cloudy days.

• They form at night time.

• They form at higher latitudes, closer to the poles

• They form in the winter time, when the sun is shining less.

Areas near the equator get more direct sunlight, leading to higher temperatures.

• True

• False

These convection currents combined with Earth's rotation on its axis cause the movement of air masses.

• True

• False

A cold front often results in what kind of weather?

• Sunny, warmer weather

• Rainy, colder weather

• Windy weather

Warm fronts usually results in...

• light rain and warmer weather

• snow and wind

• wind and heavy rain

What does the word "stationary" mean?

• very strong

• high heat

• to move quickly

• to stay in one place

What causes cloud formation?

• Dust particles in the air clump together due to wind.

• Water vapor rises into the atmosphere, cools down, and condenses.

• On sunny days the heat evaporates more water into the sky.

The narrow belts of strong winds in the upper troposphere are called ...

• jet streams.

• the doldrums.

• the prevailing westerlies.

• the trade winds.

Cold air (RISES/ FALLS)  _________.

• RISES
• FALLS