Groundwater Earth Science Ch 5 p 140 148 Supplementary Textbook Materials Ch 16 p 153 168 Wells Wells after drawdown Artesian wells Ogallala supported agriculture Ogallala Aquifer Exploited in Great Plains agriculture Water table dropped Recharge rate low San Joaquin Valley subsidence Not able to recover due to aquifer compaction Groundwater purification Groundwater purification Agriculture sources of groundwater contamination Landfill leachate contamination Primary sewage treatment Secondary sewage treatment Sewage treatment Drinking Water Standards Carlsbad Caverns Arecibo Puerto Rico Radio Telescope in Sinkhole Karst drainage of manmade lake in Missouri Karst towering buttes http en wikipedia org wiki Yangshuo Thailand Karst Towers http www siue edu GEOGRAPHY ONLINE Gillespie htm
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