16-1 and 16-2

Two gases that make up 99% of Earth's atmosphere

• carbon dioxide & oxygen
• nitrogen & carbon dioxide
• nitrogen & oxygen
• nitrogen & water vapor

Layer of Earth's atmosphere where most of the water vapor and carbon dioxide is found

• thermosphere
• mesosphere
• stratosphere
• troposphere

Layer of Earth's atmosphere where weather occurs

• thermosphere
• mesosphere
• stratosphere
• troposphere

Uppermost layer of Earth's atmosphere

• thermosphere
• mesosphere
• stratosphere
• troposphere

This gas makes up 21% of the atmosphere

• ozone
• oxygen
• nitrogen
• water vapor

What is the hottest layer in the atmosphere?

• Ionosphere
• Stratosphere
• Thermosphere
• Mesosphere

What layer is the Ozone in?

• Ozone Layer
• Startosphere
• Troposphere
• It's not in one, it has its own

The _____ protects us from the harmful UV rays of the sun.

• Troposphere
• Ozone Layer
• Exosphere
• Stratosphere

What happens to the air pressure the higher up in space you go?

• the air pressure increases
• the air pressure decreases
• the air pressure stays the same
• there is no air pressure

As you go higher in the troposphere, the temperature _______________.

• decreases
• increases
• stays the same
• gets very hot