Name the different layers of the atmosphere. Write two importance of the atmosphere.

On the basis of composition, density and temperature, the different layers of the atmosphere are:

1. Troposphere
2. Stratosphere
3. Mesosphere
4. Thermosphere
5. Exosphere

Two importance of the atmosphere are:

1. It maintains the earth's temperature by keeping it warm even at night.
2. Protection from harmful ultraviolet rays of the sun.