Aquifer - An area of permeable rock underground that holds or transmits groundwater; pumps are used to retrieve water from these areas, Drainage Divide - A geographical barrier, such as a ridge, hill, or mountain, separating one watershed land area from another, Groundwater - Water that collects in cracks and pores in underground soil and rock layers, Nonpoint Source Water Pollution - Pollutants introduced into surface water or groundwater that are without a specific source location, such as water flowing over a lawn that has been fertilized and then into a drain, Permeable Rock - Rock or rocky material that water can flow through, Point Source Water Pollution - A single identifiable and localized source of water pollution, such as wastewater discharge into a stream , Saturation Zone - Area below the water table where all spaces not filled with solid material fill with water, Subsidence - Sinking of land surface due to underlying compression of Earth material as a result of the removal of groundwate, Water Table - The top of the saturation zone, below which water fills all open spaces within the rock, Watershed - An area of land where the surface water and groundwater drain into a particular body of water; separated from other watersheds by drainage divides,

Watershed

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