The space on earth where water exists is called hydrosphere. Hydrosphere is spread over 15 km in earth’s atmosphere and down 1 km into the earth’s crust. There exists a hydrologic cycle through which water circulation is maintained in the hydrosphere. Hydrologic cycle is continuous and without any beginning or end. This cycle starts with the water evaporation from ocean surface and lands. This vapour becomes a part of the atmosphere. After some time condensation of water vapour occurs and results in precipitation, interception by vegetation, overland flow, subsurface soil flow, surface runoff etc. In the earth water is stored in oceans, groundwater (fresh and saline), ice, soil, snow, lakes, rivers, marshes and in atmosphere. Many physical parameters influence the hydrology of a region. Some examples are vegetation, topography, geology, human activities etc.
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