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The energy input to the hydrological cycle is by ____________

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The energy input to the hydrological cycle is by ____________

(a) Wind

(b) Water

(c) Sun

(d) Head

This question was posed to me in an interview.

This intriguing question originated from Hydrology topic in portion Hydro Electric Power Plant of Energy Engineering

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The correct option is (c) Sun

To elaborate: The energy input to hydrological cycle is sun. Due to sun, water evaporates from water bodies. On cooling, the vapors form cloud which falls down in the form of rain, snow, hail etc which is known as precipitation.

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