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Air Masses Regents Practice
1. Which area is the most common source region for cold, dry air masses that move over New York
State?
A) North Atlantic Ocean
C) central Canada
B) Gulf of Mexico
D) central Mexico
2. Base your answer to the following question on the image below.
Locations A and B on the map of North America below are source regions for air masses.
Compared to the air mass formed at location B, the air mass formed at location A will normally be
A) cooler and drier
C) warmer and drier
B) cooler and wetter
D) warmer and wetter
3. Most of the air in the lower troposphere at the equatorial low-pressure belt is
A) warm, moist, and rising
C) cool, moist, and sinking
B) warm, dry, and rising
D) cool, dry, and sinking
4. Which air mass is associated with low relative humidity and high air temperature?
A) maritime polar
C) continental polar
B) maritime tropical
D) continental tropical
5. An air mass classified as cT usually forms over which type of Earth surface?
A) cool water
B) cool land
C) warm water
6. The properties of an air mass are mostly determined by the
A)
B)
C)
D)
rate of Earth’s rotation
direction of Earth’s surface winds
source region where the air mass formed
path the air mass follows along a land surface
D) warm land
7. Which map shows the two correctly labeled air masses that frequently converge in the central plains to
cause tornadoes?
A)
B)
C)
D)
8. Which geographic area is a common source region for cP air masses that move into New Jersey?
A) southwestern United States
C) the north Pacific Ocean
B) central Canada
D) the Gulf of Mexico
9. An air mass classified as mP usually forms over which type of Earth surface?
A) warm land
B) warm ocean
C) cool land
D) cool ocean
10. An Earth science student observed the following weather conditions in Albany, New York, for 2 days:
The first day was warm and humid with southerly winds. The second day, the temperature was 15
degrees cooler, the relative humidity had decreased, and wind direction was northwest. Which type of
air mass most likely had moved into the area on the second day?
A) continental tropical
C) maritime tropical
B) continental polar
D) maritime polar
11. An air mass classified as mT usually forms over which type of Earth surface?
A) cool land
B) cool water
C) warm land
D) warm water
12. Which type of air mass most likely has high humidity and high temperature?
A) cP
B) cT
C) mT
D) mP
13. Air masses are identified on the basis of temperature and
A) type of precipitation
C) moisture content
B) wind velocity
D) atmospheric transparency
14. Base your answer to the following question on the weather map of North America below. The map
shows the location of a front and the air mass influencing its movement.
Which region is the probable source of the air mass labeled cP on the map?
A) central Canada
C) North Atlantic Ocean
B) southwestern United States
D) Gulf of Mexico
15. Base your answer to the following question on the maps below and on your knowledge of Earth
science. The maps show a portion of India and Southeast Asia, bordering on the Indian Ocean, during
the winter and summer monsoon seasons. Large areas of high and low air pressure are shown during
each season.
Which two-letter symbol represents the most likely air mass formed over portions of the Indian Ocean
shown on the maps?
A) mP
B) mT
C) cP
D) cT
16. Which type of air mass is associated with warm, dry atmospheric conditions?
A) cP
B) cT
C) mP
D) mT
17. Which weather instrument is used to determine wind direction?
A)
B)
C)
D)
18. The map of North America below shows the source region of an air mass forming mostly over
Mexico.
This air mass originating over Mexico is classified as
A) continental polar
C) maritime polar
B) continental tropical
D) maritime tropical
19. Compared to a maritime tropical air mass, a maritime polar air mass has a
A)
B)
C)
D)
higher temperature and more water vapor
higher temperature and less water vapor
lower temperature and more water vapor
lower temperature and less water vapor
20. Base your answer to the following question on the weather map below and on your knowledge of
Earth science. The map of a portion of eastern North America shows a high-pressure center (H) and a
low-pressure center (L), frontal boundaries, and present weather conditions.
What was the most likely source region for the air mass over Pennsylvania?
A) New York State
C) Gulf of Mexico
B) Pacific Ocean
D) Canada