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 Earth loses absorbed heat primarily by radiating long-wavelength infrared energy upward into space and through atmospheric convection and evaporation. This radiative cooling prevents thermal buildup and maintains stable global temperatures. Class 9 Science Chapter 13 Earth as a System: Energy, ...
Plants absorb atmospheric carbon dioxide through photosynthesis. Carbon returns to the air through plant and animal respiration, microbial decomposition of organic remains and the combustion of biomass and fossil fuels. Class 9 Science Exploration New Book All Chapter Solution Revise, Reflect, Refine ...
Deforestation reduces photosynthetic oxygen production while diminishing major terrestrial carbon sinks, elevating atmospheric carbon dioxide. It further accelerates severe topsoil erosion, decreases transpiration rainfall and destroys wildlife biodiversity. Chapter 13 Earth as a System: Energy, Matter and Life Solutions Class 9 Science ...
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 ...