irrigation - the process of supplying fresh water to farm fields for growing crops., groundwater - water collects in spaces and cracks in rocks and soil underground., desalination - the removal of salt from salt water to make fresh water., aquifer - an underground layer or rock or soil through which water easily moves. , aqueduct - a system of channels, pipes, or tunnels that carry water a long distance. , conservation - the careful use of a natural resources , such as water., reservoir - a natural or artificial pond or lake used to collect or store fresh water. , runoff - rainwater that flows over land without sinking into the soil., spring - a natural flow of water that forms where the water table meets the lands sufrace, water reclamation - the recycling of waste water to be used again. , water table - the surface of the layer of saturated ground., watershed - the region of land that drains into a river. , well - a hole dug or drilled into the ground to provide a supply if water.,

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