Question
Write a short note on different layers of atmosphere.
✓
Answer
Our atmosphere is divided into five layers starting from the earth’s surface.
- Troposphere: This layer is the most important layer of the atmosphere. Its average height is 13km. The air we breathe exists here. Almost all the weather phenomena like rainfall, fog and hailstorm occur in this layer.
- Stratosphere: Above the troposphere lies the stratosphere. It extends up to a height of 50km. This layer is almost free from clouds and associated weather phenomenon, making conditions most ideal for flying aeroplanes. One important feature of stratosphere is that it contains a layer of ozone gas which protects us from the harmful effect of the sun rays.
- Mesosphere: This is the third layer of the atmosphere. It lies above the stratosphere. It extends up to the height of 80km. Meteorites burn up in this layer on entering from the space.
- Thermosphere: In thermosphere temperature rises very rapidly with increasing height. Ionosphere is a part of this layer. It extends between 80-400km. This layer helps in radio transmission. In fact, radio waves transmitted from the earth are reflected back to the earth by this layer.
- Exosphere: The upper most layer of the atmosphere is known as exosphere. This layer has very thin air. Light gases like helium and hydrogen float into the space from here.
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