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Class 7Air— NCERT Geography, Chapter 4. The earth is wrapped in a blanket of air, the atmosphere, which gives us the air we breathe, shields us from the sun's harmful rays and keeps temperatures liveable. Dry…
Class 9Atmosphere and Climate— NCERT Social Science, Chapter 3. The atmosphere is a blanket of air held by gravity: by volume about 78% nitrogen, 21% oxygen, 0.93% argon and 0.04% carbon dioxide, with variable water vapour and dust.…
Class 11Solar Radiation, Heat Balance and Temperature— NCERT Geography, Chapter 8. The earth gets almost all its energy from the sun as short waves (insolation). How much a place receives depends mainly on the tilt of the axis, the angle of the sun's…
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