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Air — Social Studies STD 7 — Question

CBSE BoardEnglish MediumSTD 7Social StudiesAir5 Marks
Question
Examine the structure of the atmosphere.
✓

Answer

The structure of atmosphere is divided into five layers. These include:-
  1. Troposphere:- Its average height is 13km and all weather phenomena like rainfall, fog and hailstorm occur here. The air we breathe is found here.
  2. Stratosphere:- It extends up to a height of 50km. It is free from weather conditions and clouds making it ideal for flying aeroplanes. It even contains ozone layer, which protects us from the harmful sun rays.
  3. Mesosphere:- It extends up to a height of 80km. Meteorites burn up in this layer on entering from the space.
  4. Thermosphere:- In this, the temperature rises with increasing height. Ionosphere is a part of this layer. It extends 80-400km. It even helps in radio transmission. Radio waves transmitted from the earth are reflected back to the earth by this layer.
  5. Exosphere:- It is the upper most layer and has very thin air. Light gases like helium and hydrogen float into the space from here.

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