1. Earth’s Atmosphere
p. D6-9

2. Atmosphere The layer of air around Earth
Can be compared to a very thin blanket, surrounding our planet
Made up of billions of gas particles
These include nitrogen, oxygen, carbon dioxide, and water vapor

3. Air Pressure
All the particles of air pressing down are called “air pressure”.
This pressure changes as you move up or down in the atmosphere.
Higher up-lower pressure

4. Layers of Atmosphere
Troposphere-where we live and where most weather happens
Stratosphere-contains most of the ozone that protects us from the sun’s rays
Mesosphere-coldest layer
Thermosphere-hot outer layer