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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 10Our Environment— NCERT Science, Chapter 13. The last chapter of NCERT's Class 10 science book looks at how living things and their surroundings work together, and how we upset that. An ecosystem is all the…
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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