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Hydrological Cycle | hydrological cycle definition | hydrological cycle process | hydrological cycle steps

Hydrological Cycle

The water of the universe always changes from one state to another in a cyclic order under the

influence of the sun. The water from the surface source like lakes, rivers, ocean etc. converts to vapour by evaporation. These vapours get condensed due to the sudden fall in temperature and

pressure and thus clouds are formed. These clouds again causes precipitation (i.e. rainfall). Some of

the vapours are converted to ice at the peak of the mountains. The ice again melts in summer and

flows as rivers to meet the sea or ocean. These processes of evaporation, precipitation and melting of

ice go on continuously and thus a balance is maintained in the atmosphere. This earth's water circulatory

system (from the stage of evaporation from ocean to the final return to the ocean) is called hydrological


If E is the evaporation, P is precipitation and R is run-off, then the hydrological cycle is expressed

by the relation,

p= E+ R

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