Importance of the atmosphere:
1. Many useful gases are found in the atmosphere.
2. From the atmosphere, we get protection against harmful effects of ultraviolet rays.
3. Temperature and humidity found in the atmosphere influence human life.
4. Due to the atmosphere, various natural landscapes are present in front of us.
Layers of the atmosphere:
The atmosphere is divided mainly into the following five layers:
1. Troposphere: This lower layer extends from the ground up to 8 km. on the poles and 18 km. on the equator.
2. Stratosphere: This layer of the atmosphere extends from the ground up to 50 km. (above the troposphere).
3. Mesosphere: Between 50 to 80 km. from the earth’s above the stratosphere.
4. Ino – sphere: This layer extends from 80 km. to 400 km, from the ground level.
5. Exosphere: This layer is considered to be extending from 400 km. from the ground to an infinite extent.
