Biogeochemical cycle Part 2// Water Cycle

 

WATER CYCLE

The water cycle is also known as hydrologic cycle or hydrological cycle.

Water cycle is the continuous exchange of water between atmosphere, land surface and ground water and living being.

Water cycle is biogeochemical cycle which involves the whole process of evaporation of water, its falling on the land as rains and later its flowing into the sea through rives.

The water cycle involves following steps-

A.   Evaporation-

·        Evaporation is the transfer of water from the surface of water bodies like rivers, oceans etc. into the atmosphere

·        As a result of evaporation, water changes from liquid to gaseous phases.

·        In water cycle water is evaporates from oceans, ponds, lakes ground, plants (by transpiration) and animals (through sweating and respiration).

 

B.   Condensation-

·        The water vapours formed in evaporation condense and form clouds.

 

C.    Precipitation-

·        The water vapours that condense and form clouds precipitate to form rain and snow.

·        In this process when clouds are cooled due to low temperature the small droplets in them become cooler and they come closer to each other.

·        Many droplets combine and form big drop of water.

·        These drops fall down on the earth as rain.

·        This rain water falls in oceans as well as on land surface.

 

D.   Infiltration-

The rain water falling on the surface some of it floats to the sea and some of it seeps into soil and become a part of groundwater.

Ground water can either follows streams or rivers. Sometime it might be used as wells or tube wells.

This process of the water cycle is a cyclic process that has no end or beginning.

 The advantages of water cycle is that there is no loss of water, and the water present in the oceans always remain leveled and also there are clouds every time in the sky.

Water is used by plant for growth and photo synthesis and animals for various life processes.

Water Cycle

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