Dear Student,
In water cycle, the water goes through molecular transformation from liquid, through evaporation, to volatilized state, i. e. vapour, because it is heat up(warm), rises into the atmosphere. It gets condensed as clouds within the atmosphere. It eventually cools enough to fall back as rain and snow.
Hydrological cycle is the movement, storage, and pattern of surface and groundwater below the earth. In this there is usually no significant molecular transformation of the water into vapour.
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