Name: _________________________________________________________________________ Period: ___________
Unit 4 Lessons 3 Review (Influences of Weather) (85)
Matching:
A. Tropical
B. Maritime
C. Polar
D. Continental
__C_____ 1. Cold air mass from North (poles)
__D____ 2. Air mass that forms over land (Mexico and Canada)
__A_____ 3. Warm air from the tropics (equator)
__B_____ 4. Air mass that forms over oceans (Atlantic or Pacific)
5. Draw a cold front, warm front, and a stationary front. Label warm and cool air masses. Draw an arrow to
show the movement of the air. See pg. 185 for diagrams
Cold
Warm
Stationary
6. What weather comes before a cold front? _______stormy, cloudy_____________
7. What weather follows a cold front? ____________cold and dry_________________
8. What weather comes before a warm front? __________drizzly rain_____________
9. What weather follows a warm front? _________________warm and moist_______
10. What does density have to do with fronts?
Cold air is denser than warm air so cold air will sink under the less dense warm air
11. What kind of temperature (warm or cold) and humidity (wet or dry) will each air mass bring to the United
States?
Circle the correct temperature and humidity.
Air mass A
Warm/ Cold
Dry/Wet
Air mass B
Warm/ Cold
Dry/Wet
Air mass C
Warm/ Cold
Dry/Wet
Air mass D
Warm/ Cold
Dry/Wet
Air mass E
Warm/ Cold
Dry/Wet
Air mass F
Warm/ Cold
Dry/Wet
12. Fill in the chart below.
Low pressure
High pressure
rising
sinking
Counter clockwise
Clockwise
cloudy
clear
Air is rising or sinking?
Winds movement
counter -clockwise or clockwise?
Weather associated with the
pressure system
cloudy or clear?
13. Condensation – occurs when water vapor cools and changes from a gas to a liquid
14. Evaporation – occurs when liquid water changes into water vapor
15. Precipitation – occurs when rain, snow, sleet, hail or freezing rain falls from the clouds onto
Earth’s surface
16. Humidity – amount of moisture in the air
17. Barometer – instrument used to measure air pressure
18. When the barometer is falling what weather could occur? Falling means low pressure and that can bring
cloud, storm weather
19. When the barometer is rising what weather could occur? Rising means high pressure and that can bring
clear skies
20. Where do cold water currents come from? _____form the poles______ What affect do they have on the
coastal regions they flow by? Cool the coastal area
21. Where do warm water currents come from? ______equator________ What affect do they have on the
coastal regions they flow by? Warm the coastal area
22. Infrared radiation – radiation from the sun that we feel as heat
23. Ultraviolet radiation – radiation from the sun that kills living cells and can cause cancer and sunburn
24. Water cycle – the continuous movement of water between the atmosphere, the land , the oceans, and
living things.