# Stratosphere

This layer is above the troposphere.

This layer is spread upto the height of 50 kms from the Earth’s surface.

It’s average extent 40 kms.

The temperature remains almost the same in the lower the part of this layer upto the height of 20 kms.

After this the temperature increases slowly with the increase in the height.

The temperature increases due to the presence of ozone gas in the upper part of this layer.

Weather related incidents do not take place in this layer.

The air blows horizontally here.

Therefore this layer is considered ideal for flying of aircraft.