NCERT Geography class 7 ch 1 notes (part 5)

Hello friend  in this blog you are going to read geography.

1. Atmosphere is the gaseous part of the Earth.

2. It is very important for our survival as it contains the precious gas oxygen, which is important for respiration.

3. The proportion for gases in atmosphere-  
1. Nitrogen- 78%
2. Oxygen- 21%
3. Other gases like carbon-dioxide, argon, etc- 1%.

4. There are 5 layers of atmosphere-
1. Troposphere
2. Stratosphere
3. Mesosphere 
4. Thermosphere 
5. Exosphere

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