This gas makes up 21% of the atmosphere

• ozone
• oxygen
• nitrogen
• water vapor

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

What is ozone?

• 3 nitrogen atoms
• 3 oxygen atoms
• 2 oxygen atoms
• 1 oxygen atom

This layer of the atmosphere contains  the ozone

• troposphere
• thermosphere
• mesosphere
• stratosphere

This layer is where weather occurs

• troposphere
• thermosphere
• exosphere
• stratosphere

The _______  in the Stratosphere protects us from harmful UV rays.

• aurora
• weather
• convection currents
• ozone

This process keeps Earth's temperature suitable for life.

• Convection Currents
• Greenhouse Effect
• Albedo Effect
• Water Cycle

The ozone layer is important because....

• It absorbs ultraviolet radiation
• Communication satellites are there
• Meteoroids burn up there
• It reflects radio waves back to Earth

What is something that you can do to decrease the carbon dioxide in the environment?

• Tear down trees
• Recycle
• Carpool 
• Start forest fires