Air masses
Air Pressure
Key Terms
Key Terms 2
Which Way?
100
What kind of front occurs when air masses remain in place for a period of time?
a stationary front
100
Why does wind blow?
Wind blows because air has weight
100
What do you call the device that measures air pressure?
A barometer
100
What is the distance above sea level called?
elevation/altitude
100
Which way does a southwest breeze blow? (From ____ to ______)
from southwest toward the northwest
200
What kind of air mass forms over northern Canada?
polar continental
200
What kind of weather is associated with areas of high pressure?
fair weather
200
What state change is taking place as water changes from a gas to a liquid?
condensation
200
What do you call moisture in the air?
humidity
200
Usually, wind blows from areas of ______ to area of _______.
high pressure to low pressure
300
Where do maritime air masses form?
over the ocean
300
What kind of weather is associated with areas of low pressure?
stormy weather
300
What state change is taking place as water changes from a liquid to a gas?
evaporation
300
Which gas is the most prevalent in the earth's atmosphere?
nitrogen
300
Generally, on earth warm air masses move away from the _____.
equator
400
If a cold air mass overtakes a warm air mass, what kind of front is created?
a cold front
400
What kind of system is characterized by sinking, cool air?
high-pressure system
400
What do you call the temperature at which condensation occurs?
the dew point
400
What is the name for the very calm air the forms over the equator?
Doldrums
400
Which direction does a warm front usually move? (From ____ to ______)
from southwest to northeast
500
When two air masses collide and push a warm air mass between them, what kind of front forms?
occluded front
500
What kind of system is characterized by rising, warm air?
low-pressure sytstem
500
What layer of the atmosphere contains 75% of the atmosphere's gasses, as well as all life and weather?
the troposphere
500
What do you call hurricanes that form over the western Pacific Ocean?
typhoons
500
Which direction does a cold front usually move? (From ____ to ______)
northwest to southeast
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