Earth's Atmosphere

Which two gases make up most of Earth's atmosphere?

• helium and carbon dioxide

• nitrogen and carbon dioxide

• nitrogen and oxygen

• oxygen and carbon dioxide

Check all the ways Earth's atmosphere supports life.

• allows us to breathe easily

• helps fertilize soil to grow food

• keeps us warm

• protects us from UV radiation

The layer of atmosphere closest to Earth's surface is the

• stratosphere

• troposphere

• mesosphere

• thermosphere

The root word "thermo" means __________.

• heat

• rain

• air

• temperature

The largest layer of the atmosphere is the

• stratosphere

• troposphere

• exosphere

• thermosphere

The Greek root "atmo" means

• sky

• outer space

• air

• rocks/soil