(4) Planet Blue
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Earth’s Atmosphere
The atmosphere is the thin layer of gases that surrounds Earth. This layer protects the earth from the harmful rays of the sun and keeps it warm.
The atmosphere is composed of 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, 0.03 percent carbon dioxide, and traces of other gases. It is about 300 miles thick and is divided into several layers.
Earth's atmosphere is divided into four layers:
1. Troposphere
2. Stratosphere
3. Mesosphere
4. Thermosphere
The troposphere starts at Earth's surface and extends up to 5 to 10 miles high.
The stratosphere starts above the troposphere and extends up to 30 miles.
The mesosphere starts just above the stratosphere and extends up to 50 miles.
The thermosphere starts above the mesosphere and extends up to 400 miles.
The exosphere starts above the thermosphere and merges into space.
Planetary Degassing
Planetary degassing is the process by which the atmosphere of Earth was formed.
Ozone layer
The ozone layer is situated in the stratosphere layer of Earth's atmosphere.
