The Water Cycle


Various biogeochemical cycle occurs on earth, which mainly consist of water cycle, nitrogen cycle, carbon cycle, oxygen cycle, etc. These biogeochemical cycles, allows the movement of chemical substance, due to interaction of biotic and abiotic component of earth.

Water cycle

water cycle

Water Cycle

Evaporation and Transpiration

Water from seas and ocean evaporates due to heat of sun. Thus, water gets converted to vapor during evaporation and reaches high up in the atmosphere. Also, plant body contains water, due to heat water from the plant body forms vapors. Therefore, these vapors contains atmosphere.

Condensation and Precipitation

Temperature in the atmosphere is lower as compared to ground surface. Vapors reaching in the atmosphere undergo condensation and forms tiny droplets. All the tiny droplets collect together there is formation of cloud. Clouds are carried from one place to another through winds. Cloud on becoming heavy falls down in the form of rain. Thus, in condition of extreme low temperature, precipitation occurs, as a result there is freezing of water drops resulting into hailstones or snowfalls.

Absorption and Percolation

Water falls on the ground in form of rain snow fall or hailstones. This water get absorbed into the ground. Water gets drain through the soil, rocks and meets the underground water. Also, water that runs off from hills and mounts meets the flowing water like river. Underground water and flowing water ultimately flows and somewhere meets the seas and oceans.

Water evaporated from seas and oceans returns back to seas and ocean, thereby, completing the water cycle.


Keywords: Biogeochemical cycle, CBSE Class 9 Biogeochemical reaction, CBSE Class 9 Water cycle, Evaporation, Condensation, Absorption, Percolation, Transpiration.

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