​What is the atmosphere

​The atmosphere is a shell of gases that surrounds the Earth

​78% Nitrogen

21%Oxygen

0.9% argon

0.1% Other​

​

​It is divided in layers based on temperature

​We need the atmosphere to

• Live. It holds in oxygen

• Protect us from harmful chemicals and the sun's rays

​

​How many layers are there?

​5

​There are 5 layers in the atmosphere.

​The troposphere

​The troposphere

• Most air pressure

• We live here

• Weather occurs in the layer

• ​Temperature decreases the high you go.

• 0-16 km away from ground.​

• Closest to Earth​

The stratosphere

​The stratosphere

• Temperature increases as you go up

• Ozone layer is here​

• ​Large planes fly in this layer​

• ​16-50 km high from ground

​The mesosphere

​The mesosphere

• Meteors burn up here

• Coldest layer

• Temperature decreases higher you go.

• ​50-80 km high from ground

​The thermosphere

​The thermosphere

• 85 to 600 km from the ground​

• Temperatures increase higher you go

• Temperatures climb highly in this layer.

• Auroras (Northern and southern lights) occur here

• International space station (ISS) orbits here.​

• ​FiIters gamma rays and x-rays from the sun​

The Exosphere​

​The exosphere

• Temperature increases the higher you go

• Air is extremely thin.

• ​satellites orbit here

• fades to space

​Question Time