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Question

Complete the following table (Carefully study the carbon, oxygen and nitrogen cycles).
Bio-geo-chemical cycles Biotic processes Abiotic processes
1. Carbon cycle
2. Oxygen cycle
3. Nitrogen cycle

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Solution

Bio-geo-chemical cycles Biotic processes Abiotic processes
1. Carbon cycle Photosynthesis, Respiration, Decomposition Burning of fossil fuels, forest fires, volcanic activity.
2. Oxygen cycle Photosynthesis, Respiration, Decomposition. Combustion, Corrosion, rusting, formation of ozone (O3 )
3. Nitrogen cycle Biological nitrogen fixation, ammonification, nitrification, denitrification Atmospheric nitrogen fixation, industrial nitrogen fixation.

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