This document discusses the structure of the atmosphere. It describes the different layers of the atmosphere from the earth's surface upwards: the troposphere, stratosphere, mesosphere, and thermosphere. Each layer is defined, with key details provided about temperature changes and composition. The troposphere is the lowest layer close to the earth's surface. Above this is the stratosphere, where the ozone layer is located. The mesosphere follows, and then the outermost layer, the thermosphere, where temperature abruptly increases.

1. WELCOME

2. Name of the student trainee : Bismina R.
Optional Subject : Social Science
Candidate code : 13359003
Year : 2013-2014

3. Structure of The Atmosphere

4. INTRODUCTION
 The air envelope that surrounds the earth is known as
atmosphere.
Here, we can see the structure of atmosphere in detail.

5. Structure of Atmosphere
 From the earth’s surface upwards, there is a change in
temperature.
There are different layers of atmosphere.
They are: troposphere, stratosphere,
mesosphere and thermosphere.

6. TROPOSPHERE
 Troposphere is the atmospheric layer which is close to
the earth’s surface.
 The term is derived from the Greek word ‘Tropos’ means
to ‘turn’.
 The traditional zone between the troposphere and
stratosphere known as tropopause.

7. STRATOSPHERE
 It is second layer of atmosphere.
 The ultraviolet rays of the sun absorb the oxygen atoms which laid
the formation of ozone in this part of the atmosphere.
 Ozone layer lies in stratosphere.
 The transitional zone above the stratosphere is strato- pause.

8. MESOSPHERE
 This atmospheric layer extends from 50km-80km above the sea level.
 The transitional zone where the temperature remains steady is called
mesopause.

9. THERMOSPHERE
 This is an area where the
temperature increases
abruptly.
 The part of the thermosphere, from about 80
kilometers to 400 kilometers, above the earth
surface is called ionosphere.

10. CONCLUSION
Air extends to a height of several kilometers from the
surface of the earth.
The atmosphere is held to the earth by gravitational
force.

11. REFERENCE
Text book of Standard-XI