Answer:
Our atmosphere has five different layers. They are:
(i) Troposphere: It is the most important layer of the atmosphere with average height of 13 km from the earth. The air that we breathe exists here. Almost all the weather phenomena such as rainfall, fog and hailstorm occur here.
(ii) Stratosphere: This layer extends up to a height of 50 km. It presents the most ideal conditions for flying aeroplanes. It contains a layer of ozone gas which protects us from harmful effects of the sun rays.
(iii) Mesosphere: This layer extends up to a height of 80 km. Meteorites burn up in this layer on entering from the space.
(iv) Thermosphere: In this layer, temperature rises very rapidly with increasing height. Ionosphere is the part of this layer. This layer extends between 80- 400 km. It helps in radio transmission. Radio waves transmitted from the earth are reflected back to the earth by this layer.
(v) Exosphere: It is the uppermost layer where there is very thin air. Light gases such as helium and hydrogen float into the space from here.
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