Geo Notes April 26
Geo Notes April 26 GEO 101
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This 3 page Class Notes was uploaded by Carter Cox on Tuesday April 26, 2016. The Class Notes belongs to GEO 101 at University of Alabama - Tuscaloosa taught by Keene in Spring2015. Since its upload, it has received 17 views. For similar materials see Dynamic Earth in Geology at University of Alabama - Tuscaloosa.
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Date Created: 04/26/16
Geo notes April 26 Why is New Orleans below sea level - Human activity o Wetland removal No where for water to go o Artificial Levees No new sediment o Extracting Groundwater Comparing sediment - Isostacy o Lithosphere maintaining equilibrium What are deserts? - Dry region that has o No permanent streams o Less than 15% surface vegetation coverage o Less than 25cm rain/ year - Can be hot or cold Types of deserts - Subtropical o Global air circulation - Rain Shadow - Coastal - Continent Interior o Far from ocean o Air moisture used over continent - Polar o Global air circulation o Cold air is dry Weathering and Erosion Desert Weathering - Physical weathering o Wedging, abrasion, jointing, biological, mass wasting - Chemical o Desert varnish- microbial action on clay Water Erosion - Flash floods - High competency and capacity - High turbulence Wind Erosion - Wind is a fluid- erodes like water o Energy level determines grain size Desert Deposition - Alluvial Fan o Abrupt change in velocity o Stream dumps coarse sediment - Talus Apron o Pile of debris o Gravity - Salt Lake o No outlet o Water collects and evaporates o Salt concentrates - Playa o Dry lake bed - Dunes o Wind moves sand o Wind carries small grains away o Larger grains only move so far Dune Formation - Sand blows up one side - Falls down other side Types of Dunes - Amount of sand - Wind direction and speed Formation of Desert Landscape - Mass wasting - Weathering - Erosion Desert Pavement - Natural stone mosaic with soil underneath Soil Crust - Organisms on surface Desertification - Changing non deserts into deserts - Causes o Deforestation o Overgrazing o Agriculture o Water mismanagement o Drought
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