The document discusses the five layers of the atmosphere: 1) The troposphere extends to 13 km where weather occurs and we breathe. 2) The stratosphere extends to 50 km and is free of clouds. 3) The mesosphere extends to 80 km where meteorites burn up upon entry. 4) The thermosphere extends from 80-400 km, temperatures rise rapidly, and contains the ionosphere which helps radio transmission. 5) The exosphere is the uppermost layer where light gases escape into space.

1. TOPIC - STRUCTURE OF THE ATMOSPHERE

2. STRUCTURE OF ATMOSPHERE:-
FIVE LAYERS OF ATMOSPHERE :-

3. Troposphere: This layer is the most important layer of the
atmosphere. Its average height is 13 km. The air we breathe
exists here. Almost all the weather phenomena like rainfall, fog
and hailstorm occur in this layer.
Stratosphere: Above the troposphere liesthestratosphere. Itextends
uptoaheightof 50km.Thislayeris almostfree fromclouds and
associatedweather phenomenon, makingcondition most ideal for
flying aeroplanes.
Mesosphere: Thisisthethirdlayeroftheatmosphere.Itliesabovethe
stratosphere. Itextendsuptotheheightof80km.Meteorites burnupin
thislayeronenteringfromthespace.

4. Thermosphere : In thermosphere temperature rises
very rapidly with increasing height. Ionosphere is a
part of this layer. It extends between 80-400 km. 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.

5. CONCLUSION