Cool air. Does it rise or sink?

• It rises.
• It sinks.

What type of front is this? What direction is it moving in?

• warm front, northwest
• warm front, southeast
• cold front, northwest
• cold front, southeast

What does this symbolize?

• cold front
• warm front
• stationary front

Rain, snow, sleet, hail are all examples of

• evaporation
• condensation
• precipitation

Where is the ozone layer located and why is it important to life on Earth?

• The ozone layer is in the troposphere. It is important because of the greenhouse effect.

• The ozone layer is in the stratosphere. It protects Earth from ultraviolet radiation from the sun.

Why are CFCs (chloroflorocarbons) dangerous to planet Earth?

• CFCs destroy the ozone layer which protects Earth from ultraviolet rays.
• CFCs protect the earth

How do High Pressure (happy weather) and Low Pressure (lousy weather) move across the United States?

• High to Low
• Low to High

Temperature has nothing to do with air pressure.

• True
• False

What is needed in the atmosphere for clouds to form?

• nebula
• condensation nuclei

Hot air. Does it rise or sink?

• It rises.
• It sinks.