Wetterfronten

In a high pressure systems

• there are few clouds because the air in moving downward
• there are many clouds because the air is very humid
• there are few clouds because the air is moving outward
• there are many clouds because the air is moving upward

A front is

• where warm air is cooling at earth's surface
• a line where hot and cold air are separating
• a line where two different air masses meet
• where cold air is rising and forming rain clouds

When I cold front is approaching, what happens?

• warm air is pushing under cold air causing humid weather and lower temperatures
• warm air is pushing under cold air causing humid weather and higher temperatures
• warm air rises, cools, and causes rain and thunderstorms
• cold air is pushed over warm air causing rain and thunderstorms

The symbol on a weather map for a cold front is what?

• a line with triangles on it
• a line with semi-circles on it
• a line with squares on it
• a line with circles on it

If an air mass is rising, it must be

• cold and less dense
• cold and more dense
• warm and more dense
• warm and less dense

If an air mass is sinking, it must be

• cold and less dense
• cold and more dense
• warm and more dense
• warm and less dense

When two air masses meet, what happens?

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

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

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

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 

This is the symbol for which type of front?

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