Earth's Dynamic Systems

This gas makes up 21% of the atmosphere

• ozone
• oxygen
• nitrogen
• water vapor

This layer of the atmosphere contains most of the ozone.

• troposphere
• thermosphere
• mesosphere
• stratosphere

This gas makes up 78% of the atmosphere

• oxygen
• nitrogen
• ozone
• carbon dioxide

Why is ozone important?

• It absorbs harmful UV rays.
• It breaks meteors apart.
• It is what we breathe.
• It is important to weather.

This is the coldest layer of the atmosphere.

• troposphere
• thermosphere
• mesosphere
• stratosphere

This layer is where weather occurs.

• troposphere
• thermosphere
• exosphere
• stratosphere

Planes fly in this layer to get out of the weather.

• stratosphere
• mesosphere
• exosphere
• thermosphere

This layer is the hottest.

• troposphere
• mesosphere
• stratosphere
• thermosphere

What are the 2 most abundant gases in Earth's atmosphere?

• carbon dioxide and oxygen
• carbon dioxide and nitrogen
• nitrogen and oxygen
• nitrogen and hydrogen 

Where is the temperature the highest?

• 1
• 2
• 3
• 4