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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 11Composition and Structure of Atmosphere— NCERT Geography, Chapter 7. The atmosphere is a mixture of gases, water vapour and dust that envelops the earth; 99% of its mass lies within 32 km. Oxygen becomes negligible by 120 km; carbon…
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