write about water cycle.
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The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time but the partitioning of the water into the major reservoirs of ice, fresh water, saline water and atmospheric water is variable depending on a wide range of climatic variables. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapour.
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Water Cycle refers to the cycle of processes by which water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into Rain or snow in clouds, falls to the surface as Precipitation and is collected once again in lakes, rivers and oceans. Solar energy, in the form of heat and light, besides gravity, causes the transfer of water from one state to another over periods ranging from hours to thousands of years.
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