Geog 1113 Notes- Week 6
Geog 1113 Notes- Week 6 GEOG 1113
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This 2 page Class Notes was uploaded by Victoria Koehl on Wednesday September 28, 2016. The Class Notes belongs to GEOG 1113 at Georgia State University taught by Larry Kleitches in Fall 2016. Since its upload, it has received 3 views.
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Date Created: 09/28/16
Geography 1113 Notes Karst topography Identified by sink holes, sinkhole ponds, fissures, lost rivers, and underground rivers created when caverns collapse Karst topography is common where limestone is abundant Forms where bedrock is made of calcite or dolomite Karst is important because: Karst is vital to surface water Karst surface water can be easily polluted Karst contains tremendous groundwater resources Karst caves are special habitats Karst caves contain cultural resources Karst caves are recreational resources Karst can be hazardous Groundwater mixes with carbon dioxide to form carbonic acid Limestone is a rock easily dissolved by carbonic acid As acidic groundwater moves through pores in limestone, the rock dissolves which enlarges cracks until it forms an underground opening called a cave Groundwater can also make deposits on the insides of caves Water dripping from the cave walls contains calcium ions from limestone, if the water evaporates while hanging from the ceiling then the calcium carbonate is left which builds up to form a stalactite When water drops fall to the floor, the mineral drippings accumulate over time and a rock formation, called a stalagmite, rises from the cave floor If underground rock is dissolved near the surface a sinkhole may form A sinkhole is a depression on the surface of the ground that forms when the cave roof collapses, or when rock near the surface dissolves These are common in areas with lots of limestone and enough rain to keep the groundwater system supplied with water Groundwater accounts for 20% of all water used in the U.S. Unwise use can damage or deplete groundwater reservoirs Some problems related to groundwater use include: Overpumping lowering the water table Subsidence Contamination When a well is sited down the flow direction of groundwater from a source of pollution, the pollutants will move into the part of the aquifer the well uses and the water will be contaminated Even a carefully sited well can be undone by such a reversal of flow. A well tapping a part of the water table where flow is towards the contaminated region can't get contaminated However, a cone of depression below has reversed the flow, now allowing the pollution to move toward the well Contaminants introduced at the land surface may infiltrate to the water table and flow towards a point of discharge, either a well or a stream Contamination results in a decline in water quality Groundwater usually moves slowly 2
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