Atmosphere
Air Pressure
Mixed Bag
Causes of Weather
Weather Systems
100
This is the percentage of oxygen in the atmosphere.
What is 21%
100
The distance form sea level is called
What is altitude?
100
As you rise in the atmosphere, air pressure does this.
What is decreases?
100
The protective layer of gases surrounding Earth
What is the atmosphere ?
100
This type of pressure brings clear and sunny weather.
What is a high pressure system?
200
This layer of the Atmosphere has life, clouds and weather.
What is the troposphere?
200
As density increases, so does this.
What is air pressure
200
The trapping of heat by gases in the atmosphere is this.
What is the greenhouse effect?
200
A large body of air with the same characteristics, such as temperature and humidity.
What is an air mass?
200
This type of local breeze takes place in the daytime when the sun is out.
What is a sea breeze?
300
This blocks harmful ultra violet rays from reaching Earth.
What is the ozone?
300
Air has pressure because air has this.
What is mass?
300
To reduce fossil fuel use, we could all do this.
What is drive less or take public transportation?
300
High speed winds that travel in the stratosphere.
What is the jet stream?
300
This type of front occurs when a cold air mass moves faster than a warm air mass and overtakes it.  Usually results in intense precipitation.
What is a cold front?
400
The changes of temperature as altitude increases means the start of ... 
What a new layer in the atmosphere
400
This instrument measures air pressure.
What is a barometer?
400
Heat travels from the sun through space.  We call this ....
What is radiation?
400
Wind always travels in this direction.
What is high pressure to low pressure.
400
When a cold air mass and a warm air mass meet and neither move for a long time, this type of front forms.
What is stationary?
500
This layer of our atmosphere has the greatest air pressure.
What is the troposphere?
500
The less mass of air the less.... (two possible answers)
What is pressure or density?
500
List the 4 main layers in order from the Earth's surface to space.
What are troposphere, stratosphere, mesosphere, exosphere?
500
When the sun warms the land and the land warms the air, the air rises causing this type of pressure system.
What is low pressure?
500
This term refers to warm air rising and cool air sinking.
What is convection?
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