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    Question

    Write a paragraph about the structure of the atmosphere.

    The five atmospheric layers are:

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    (a) Troposphere:

    The lowest layer of the atmosphere is the troposphere.This layer extends upto 8 kms at the poles and upto 18 kms at the equator.The temperature decreases with increasing height. It is called weather making a layer.

    (b) Stratosphere:

    Stratosphere lies above the troposphere.It extends to a height of about 50 km above earths surface.Since this layer is a concentration of ozone molecules, it is also referred to as the ozonosphere.Large jet planes normally fly here.

    (c) Mesosphere:

    The mesosphere extends between 50 km and 80 km.The temperature increases with increasing height.Radial waves transmitted from earth are reflected back to earth from this layer Most of the meteors nearing the earth, get burned here.

    (d) Thermosphere:

    The thermosphere exists above the Mesosphere.It extends to about 600 km.The composition of gases in the lower thermosphere is more or less uniform, hence it is called Homosphere.The upper portion of the thermosphere has an uneven composition of gases and hence it is referred to as Heterosphere.

    (e) Exosphere:

    The uppermost layer of the atmosphere is called the exosphere.This layer is extremely rarefied with gases and gradually merges with the outer space.This zone is characterised by aurora Australis and aurora borealis.

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    Write a paragraph about the structure of the atmosphere.

    Write a paragraph about the structure of the atmosphere.

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    Describe the structure of the atmosphere.

    Write a paragraph about the structure of the atmosphere.

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    SOLUTION 1

    In the atmosphere, there are concentric layers of air. Each layer has a different density. The upper layers press down the lower one. So, the air of the lower layer is always heavier or denser, while the upper layers are thinner or less dense. In this way, about 90 percent of the mass of air lies within a height of about 20 km from the surface of the earth. On the basis of the characteristics of temperature and air pressure there exist four thermal layers of the atmosphere. They are Troposphere, Stratosphere, Mesosphere, and Thermosphere. The Thermosphere is divided into Ionosphere and Exosphere.

    SOLUTION 2

    Atmosphereric layers:

    The atmosphere is thick near the earth surface and thins out until it eventually merges with space.

    The five atmospheric layers are: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.

    Troposphere:

    The lowest layer of the atmosphere is the troposphere.

    This layer extends upto 8 kms at the poles and upto 18 kms at the equator.

    The temperature decreases with increasing height.

    It is called weather making layer.

     Stratosphere:

    Stratosphere lies above the troposphere.

    It extends to a height of about 50 km above earth surface.

    Since this layer is a concentration of ozone molecules, it is also referred as ozonosphere.

    Large jet planes normally fly here.

    Mesosphere:

    Mesosphere extends between 50 km and 80 km.

    The temperature increases with increasing height.

    Radial waves transmitted from earth are reflected back to earth from this layer

    Most of the meteors nearing the earth, get burned here.

    Thermosphere:

    Thermosphere exists above the Mesosphere.

    It extends to about 600 km.

    The composition of gases in the lower thermosphere is more or less uniform, hence it is called ‘Homosphere’.

    The upper portion of the thermosphere has uneven composition of gases and hence it is referred as ‘Heterosphere’.

    Exosphere:

    The uppermost layer of the atmosphere is called exosphere.

    This layer is extremely rarefied with gases and gradually merges with the outer space.

    This zone is characterised by aurora Australis and aurora borealis.

    Concept: Composition of the Atmosphere

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    Chapter 2.03: Atmosphere - Exercises [Page 191]

    Q VI. 1 Q V. 4 Q VI. 2

    APPEARS IN

    Tamil Nadu Board Samacheer Kalvi Class 9th Social Science Answers Guide

    Chapter 2.03 Atmosphere

    Exercises | Q VI. 1 | Page 191

    Morning Star ICSE Class 9 Total Geography

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    Write a paragraph about the structure of the atmosphere. Paragraph Questions:

    Write a paragraph about the structure of the atmosphere. Paragraph Questions:

    Q. 6 A 4.0 ( 2 Votes )

    Paragraph Questio

    Class 9th

    Tamilnadu - Social Science Term-1

    3. Atmosphere Answer :

    The blanket of air that surrounds the earth’s surface is called atmosphere which is being held close to the earth by gravitational force. The atmosphere is a mixture of gases, water vapour and dust particles in different proportions. Nitrogen and Oxygen are permanent gases of the atmosphere. The other solid particles that are present in the atmosphere include dust particles, salt particles, pollen grains, smoke, soot, volcanic ashes etc. The following diagram shows the layers in the atmosphere:

    The structure of the atmosphere consists of five layers:

    1. Troposphere:

    This is the lowest layer of the atmosphere. It extends up to 8 kilometres at the poles and up to 18 kilometres at the Equator. It is called weather making layer because almost all the weather phenomena take place in his layer.

    2. Stratosphere:

    The layer lies above the troposphere. It extends to a height of about 50 kilometres above the surface of the earth. This layer is also called “ozonosphere” since this layer has a concentration of ozone molecules. Large jet planes normally fly here.

    3. Mesosphere:

    This layer lies above the stratosphere and extends between 50 kilometres and 80 kilometres. In the mesosphere, temperature increases as the altitude increases. Most of the meteors nearing the earth get burned here.

    4. Thermosphere:

    This layer exists above the mesosphere and extends up to 600 kilometres. Thermosphere also contains another layer called “Ionosphere” that contains Ions and free electrons. The "Aurora" mostly occurs in this layer.

    5. Exosphere:

    This is the uppermost layer of the atmosphere. It is a thin layer where molecules are gravitationally bound to that body. It is same as the airless void of outer space.

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