Weather Fronts

What are air masses?

• Large pockets of air that may cover ten thousand or more square miles
• temperature
• wind
• water

When a cold front or a warm front stays in place for several days without invading another front, it is called a ______. 

• stationary front 
•  cold front 
• occluded front
• warm front 

Air masses are named for ______.

• the type of air they contain 
• animals
•  people
•  where they where they form 

A cold front usually brings what kind of weather?

• snow  
• sunny and fair
• rain and/or thunderstorms 
•  cool and dry 

Low pressure air masses are called ______.

• cyclones  
• occluded front 
• anti cyclones 
•  stationary front

When two air masses meet, what happens?

• The weather changes and precipitation usually occurs.
• wind
• water
• volcano

Warm air is ______.

• less dense than cold air 
• lighter than cold air
• thinner than cold air 
• all of the above

When a warm and a cold air mass meet, what happens?

• The warm air would slide up and over the cold air. 
• Some form of precipitation would occur.
• The heavier cold air would sink and slide in under the warm air.
• all of the above

Cooler air can hold less water than warm air.

• true
• false

Air masses are different in many ways. Which of these is NOT different?

• moisture contents 
• ratio of oxygen/nitrogen  
•  atmospheric pressure
•  temperature