Atmosphere


 
 
Concept Explanation
 

Atmosphere

Atmosphere:

The envelope of gases extending to a height of about 1600 km from the surface of the earth is called the atmosphere. An example of atmosphere is the ozone and the other layers which make up the Earth's sky as we see it. 

Earth's atmosphere is composed of about 78% nitrogen(N_2) , 21% oxygen(O_2) ,0.9% argon(Ar) ,0.1% other gases. Trace amount of  carbon dioxide (CO_2), methane(CH_4), water vapours and neon are some of the other gases that make up the remaining 0.1%.

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Sample Questions
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Question : 1

In which layer of atmosphere most of the air is present?

Right Option : A
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Question : 2

The layer which is present on the ground level is ________________.

Right Option : A
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Question : 3

Which of the following are correct :

(a) Troposphere, stratosphere, mesosphere, thermosphere and  exosphere are the layers of atmosphere.

(b) An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body. 

Right Option : C
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