PrecipitationAny form of water that falls from clouds and reaches Earth's surface.InfiltrationDownward movement of water through soil.RunoffWater that moves across the land surface and into streams and riversAquifera body of permeable rock that can contain or transmit groundwater.Permeablepenetrable; porous; allowing liquids or gas to pass throughGroundwaterthe water that is beneath Earth's surfaceWatershedan area or ridge of land that separates waters flowing to different rivers, basins, or seas.River BasinThe entire geographical area drained by a river and its tributariesGlacierAny large mass of ice that moves slowly over landTributatiesstreams that flow into a larger body of waterDividea ridge of land that separates one watershed from anotherMississippi River WatershedLargest watershed in the USErosional Stream LoadAll the materials that the water in a stream carriesHeadwaterThe region where water first accumulates to supply a streamFloodplainBroad, flat, fertile area extending out from a stream's bank that floods periodicallyMeandera bend or curve in a stream channel caused by moving waterOxbow LakeA meander that has been cut off from the riverStream mouthWhere a stream or river empties into a larger body of waterAlluvial FanA fan-shaped deposit of sediment commonly found in mountainsDeposition (of sediment)Process in which sediment is laid down in new locations.Deltatriangular area of marshland formed by deposits of silt at the mouth of some riversLakeA depression in land what holds waterReservoira man-made lake where water is collected and kept in quantity for useEutrophicationexcessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.WetlandLand that is soaked with waterBogA water-soaked area with poor drainage and acidic soilMarshesWater-soaked area at the mouth of streams; Wetland with no treesSwampA low-lying area near a stream; Wetland with trees
