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.
