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Geo Notes April 28

by: Carter Cox

Geo Notes April 28 GEO 101

Carter Cox

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Dynamic Earth
Class Notes
25 ?




Popular in Dynamic Earth

Popular in Geology

This 3 page Class Notes was uploaded by Carter Cox on Thursday April 28, 2016. The Class Notes belongs to GEO 101 at University of Alabama - Tuscaloosa taught by Keene in Spring2015. Since its upload, it has received 19 views. For similar materials see Dynamic Earth in Geology at University of Alabama - Tuscaloosa.


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Date Created: 04/28/16
Geo Notes April 28 Glaciers Glacier - Made of ice - Move slowly Formation - Large amount of snow that doesn’t melt - Gentle slope - Stratified - Compact over time Glacier Ice - Water absorbs non blue light wavelengths - Less air after compaction Types of Glaciers - Mountain - Continental - Polar - Temperate Mountain Glacier (4 Types) - Ice cap o Top of mountain - Valley Glacier - Cirque o Fills low places - Piedmont Glacier o Valley glacier spreads out into plain Glacier Movement - Gravity is prime mover - Each glacier is moving at a different rate - Two main types o Basal Sliding  Slides on melt o Plastic Deformation  Solid changing shape  Occurs below about 60 meters  Ice cracks above 60 meters - Glacier always move downslope or out from center - They also advance and retreat o Larger or smaller over time o Advancing- larger o Retreating- smaller o Causes  Amount of snow  Summer temperatures Icebergs - Calving (falling off) into ocean Glacial Erosion - Incorporation- of rocks - Plucking - Bulldozing - Embedded Rocks o Striations o Polishing o Dust Erosional Landforms - Arête (Knife) o Ridge caused by 2 glaciers - Horn (Matterhorn) o Peak shaped by three glaciers - U- Shaped Valley o Scooped out by glaciers - Hanging valley o Cuts then stops o End abruptly - Fjords o Costal valleys filled with water o Sea level change Glacial Deposition - Sediment tumbles from the mountains onto the glacier - Moraine o Pile of sediment  Lateral – side of glacier  Medial – middle of glacier  End – end of glacier - Till o Sediment dropped by glacier  Unsorted - Erratic’s o Large random debris - Glacial Marine o Iceberg deposits - Glacial Outwash o Sorted - Loess o Windblown clay - Varves o Glacial lake deposits Depositional landforms - Reworked moraine and till - Erratic’s - Kettle hole Global Consequences - Ice loading and glacial rebound o Isostacy - Sea level change History of Glaciation event - Till deposits - Small frequency events - Most resent o Pleistocene Ice age - Ended o 11,000 years ago - How? o Till deposits o Pollen o Fossils Which force makes glaciers move? - Gravity


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