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The atmosphere shields Earth by filtering harsh ultraviolet rays and retains re-radiated terrestrial infrared heat via greenhouse gases like carbon dioxide and water vapor, preventing extreme daily temperature swings. Class 9 Science Exploration New Book All Chapter Solution Revise, Reflect, Refine Chapter ...

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The cycle includes nitrogen fixation, nitrification, assimilation, ammonification and denitrification. Without cycling, atmospheric nitrogen would remain unassimilated, halting plant protein synthesis and causing famine and complete biosphere collapse. CBSE Class 9 Science Chapter 13 Earth as a System: Energy, Matter and ...

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