Saturation zone - Below the water table where all spaces not filled with solid material fill with water, Groundwater - Water that collects in cracks and pores in underground soil and rock layers, Divide - A geographical barrier, Surface water - Water from precipitation that drains into a stream, which in turn flows into a river, lake, reservoir, estuary, wetland, or the ocean , Aquifer - A layer of permeable rock that allows water to flow through, Watershed - An area of land where the surface water and groundwater drain into a particular body of water separated from each other by drainage divides, Subsidence - Sunken land surface due to underlying compression of Earth material as a result of the removal of groundwater, Water table - Top of the saturation zone, Unsaturated Zone - Upper portion of soil and rock that can be temporarily filled with water, Permeable rock - Allows water to flow through the material,

Watershed

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