This leads to Subsidence Saltwater intrusion Groundwater Contamination If groundwater is contaminated it will remain contaminated for long periods of time residence time of near-surface groundwater averages about 140 years use soil/rock to dispose of many types of waste sewage-septic systems/agricultural waste - containsnutrients (N, P, and bacteria) landfill (municipal and industrial wastes) heavy metals, pesticides groundwater can become contaminated can just let pollutants dissipate naturally - may take very long periods of time or treat and remove pollutants - pump and treat/in-situ treatment The Geologic Work of Groundwater Groundwater dissolves rock - particularly limestone - Forms Caverns water dissolves and precipitates CaCO 3 stalagtites stalagmites sinkholes often become filled with water - form lakes Karst Topography - forms in limestone areas
(groundwater; is contaminated; ) (pesticides groundwater; can become; contaminated) Context(pesticides groundwater can become,List([410, 443))):(This; leads; ) (pesticides groundwater; contaminated; ) (it; contaminated; T:for long periods of time residence time of near-surface groundwater averages) (CaCO 3 stalagtites; stalagmites; sinkholes often become filled with water - form lakes) Context(CaCO 3 stalagtites stalagmites,List([738, 768))):(sinkholes; become filled; with water - form lakes; T:often) (The Geologic Work of Groundwater Groundwater; dissolves; rock - particularly limestone - Forms Caverns water dissolves and precipitates)
pesticides groundwater can become,List([410, 443)) CaCO 3 stalagtites stalagmites,List([738, 768))
groundwater pesticides groundwater This pesticides groundwater it CaCO 3 stalagtites sinkholes The Geologic Work of Groundwater Groundwater
is contaminated can become leads contaminated contaminated stalagmites become filled dissolves
contaminated
T:for long periods of time residence time of near-surface groundwater averages
sinkholes often become filled with water - form lakes
with water - form lakes T:often
rock - particularly limestone - Forms Caverns water dissolves and precipitates