The atmosphere is composed of four main layers: the troposphere, stratosphere, mesosphere, and thermosphere. The troposphere contains around 75% of the atmosphere's mass and is where weather occurs. The stratosphere contains the ozone layer which protects the Earth from UV radiation. The thermosphere is the hottest layer due to absorption of solar radiation.

1. The Atmosphere

2. The atmosphere is the blanket of air that surrounds the Earth.

3. The Earth System

4. Composition of the Air Nitrogen 78% Oxygen 21% Other gases 1% *greenhouse gases: carbon dioxide, water vapor, methane, etc.

8. Temperature Graph

10. Temperature Graph

12. Temperature Graph

14. Temperature Graph

17. Let’s summarize…

32. The End