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Air - NCERT

Our earth is surrounded by a huge blanket of aircalled atmosphere. All living beings on this earthdepend on the atmosphere for their survival. Itprovides us the air we breathe and protects us fromthe harmful effects of the sun s rays. Without thisblanket of protection, we would be baked alive by theheat of the sun during day and get frozen duringnight. So it is this mass of air that has made thetemperature on the earth OF THE ATMOSPHEREDo you know that the air we take in while breathing isactually a mixture of many gases? Nitrogen and oxygenare two gases which make up the bulk of theatmosphere. Carbondioxide, helium,ozone, argon andhydrogen are foundin lesser from thesegases, tiny dustparticles are alsopresent in the air.

Insolation is the incoming solar energy intercepted by the earth. The amount of insolation decreases from the equator towards the poles. Therefore, the Let’s do For ten days note down weather report from a local newspaper and observe the changes occurring in the weather. Wind Vane: Shows the

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