The atmosphere is composed of nitrogen making up 78%, oxygen at 21%, and other gases including argon and carbon dioxide at 1%. Earth's atmosphere consists of different layers including the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The lowest layer, the troposphere, contains around 75% of the atmosphere's mass and most weather phenomena.

1. The Atmosphere

2. Gases in Earth’s Atmosphere
-Nitrogen makes up
78%.----N2
-Oxygen 21%---O2
-Other Gases: 1%
includes: Argon and
Carbon Dioxide-CO2.

3. Layers of Earth’s Atmosphere