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Oxygen cycle along with the carbon cycle and nitrogen cycle plays an important role in the existence of life on the earth. The oxygen cycle is a biological process which helps in maintaining the oxygen level by moving through three main regions of the earth which are: # Atmosphere # Lithosphere # Biosphere. This biogeochemical cycle explains the movement of oxygen gas within the atmosphere, the ecosystem, biosphere and the lithosphere. The oxygen cycle is interconnected with the carbon cycle. The atmosphere is the layer of gases presents above the earth’s surface. The sum of all Earth’s ecosystem makes a biosphere. Lithosphere, which is the solid outer section along with the Earth’s crust and it is the largest reservoir of oxygen.