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

Which of the following is the correct order of the atmosphere layers from Earth to space?

• troposphere, stratosphere, mesosphere, thermosphere, exosphere
• troposphere, mesosphere, thermosphere, exosphere, stratosphere
• thermosphere, stratosphere, mesosphere, troposphere, exosphere
• troposphere, stratosphere, mesosphere, exosphere, thermosphere

This is the coldest layer of the atmosphere.

• troposphere
• thermosphere
• mesosphere
• stratosphere

This layer is where weather occurs.

• troposphere
• thermosphere
• exosphere
• stratosphere

This layer is the hottest.

• troposphere
• mesosphere
• stratosphere
• thermosphere

What happens to air pressure as you go higher in the atmosphere?

• It increases.
• It decreases.
• It stays the same.
• It increases and then decreases.

Where are the Aurora Borealis located?

• Troposphere
• Mesosphere
• Thermosphere
• Stratosphere

The lower part of the thermosphere is called the _________.

• Exosphere
• Ionosphere
• Ozonosphere
• Thermosphere