PPT: Air | PPTs for Class 7 PDF Download

 Page 1


GEOGRAPHY
Class 7
Page 2


GEOGRAPHY
Class 7
Page 3


GEOGRAPHY
Class 7
In this class 
? ATMOSPHERE
? COMPOSITION OF THE ATMOSPHERE
? STRUCTURE OF THE ATMOSPHERE
Page 4


GEOGRAPHY
Class 7
In this class 
? ATMOSPHERE
? COMPOSITION OF THE ATMOSPHERE
? STRUCTURE OF THE ATMOSPHERE
Our earth is surrounded by a huge blanket of 
air called atmosphere. All living beings on this 
earth depend on the atmosphere for their 
survival. It provides us the air we breathe and 
protects us from the harmful effects of the 
sun’s rays. 
Without this blanket of protection, we would 
be baked alive by the heat of the sun during 
day and get frozen during night. So it is this 
mass of air that has made the temperature on 
the earth liveable.
Page 5


GEOGRAPHY
Class 7
In this class 
? ATMOSPHERE
? COMPOSITION OF THE ATMOSPHERE
? STRUCTURE OF THE ATMOSPHERE
Our earth is surrounded by a huge blanket of 
air called atmosphere. All living beings on this 
earth depend on the atmosphere for their 
survival. It provides us the air we breathe and 
protects us from the harmful effects of the 
sun’s rays. 
Without this blanket of protection, we would 
be baked alive by the heat of the sun during 
day and get frozen during night. So it is this 
mass of air that has made the temperature on 
the earth liveable.
COMPOSITION OF THE ATMOSPHERE
? Nitrogen and oxygen are two gases which make up 
the bulk of the atmosphere. 
? Carbon  dioxide, helium, ozone, argon and hydrogen 
are found in lesser quantities.