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The geosphere, hydrosphere, cryosphere, atmosphere and biosphere continuously exchange matter and energy. For instance, winter snow melt sustains lakes, supporting surrounding grasslands and grazing animals, demonstrating their interconnected ecological harmony. Class 9 Science Exploration Chapter 13 Important Questions SQP from Class 9 ...

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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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