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Glaciers: who, what where…
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Aped valeys 1.Animated tutorial on formation and deformation, includes different types of glaciers. http://as17.as.uky.edu/academics/departments_programs/EarthEnvironmentalSciences/EarthEnvironmentalSciences/Educati onal%20Materials/Documents/elearning/module13swf.swf http://as17.as.uky.edu/academics/departments_programs/EarthEnvironmentalSciences/EarthEnvironmentalSciences/Educati onal%20Materials/Documents/elearning/module13swf.swf 2.McGraw Hill list of four animations http://highered.mcgraw- hill.com/sites/0072402466/student_view0/chapter12/animations_and_movies.html#http://highered.mcgraw- hill.com/sites/0072402466/student_view0/chapter12/animations_and_movies.html# 3.Computer animation of glacial erosion of v shaped valleys into u shaped valleys http://www.youtube.com/watch?v=O9wsnU3sK60&feature=related http://www.youtube.com/watch?v=O9wsnU3sK60&feature=related
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Glaciers: Rivers of Ice
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Bering Glacier, Alaska
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How do glaciers form?
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Snow accumulation > Snow melt
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Layers of snow accumulation, density changes.
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Crystals start to form.
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Snow under compression --- Ice crystals result.
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Dense (compacted, crystallized) glacial ice looks blue.
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How do glaciers flow like rivers?
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Glacial Deformation
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Crevasse near Hogsback
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How do glaciers move? How do crevasses form?
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When glaciers retreat…
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Moraine Lake
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Eliot Glacier Retreat and Moraines
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Fault
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Lateral moraines
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Unsorted sediments
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Lyman Glacier, Ranier
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Pac NW Past Glaciation
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Puget Sound is the result of a glacier
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Mount Hood Glaciers and stream levels
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Eliot Glacier 1901,2005
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White River Glacier
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http://whs.moodledo.co.uk/file.php/1365/Glaciall%20systems%20climate%20change/Advancing%20Glacier,%20Plucking%2 0and%20Moraine.swf Start here. http://whs.moodledo.co.uk/file.php/1365/Glaciall%20systems%20climate%20change/Advancing%20Glacier,%20Plucking%2 0and%20Moraine.swf http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/0072402466/30425/12_03.swf::Fig. 12.3 - Cross-section of an Ice Sheet polar iglacier animation http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/0072402466/30425/12_06.swf::Fig. 12.6 - Glacier Basics animation of general glacier http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/0072402466/30425/12_08.swf::Fig. 12.8 - Ice Flow in a Glacier ice flow animation http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/0072402466/30425/12_09.swf::Fig. 12.9 - Crevasses on a Glacier Crevasse foirmation http://www.classzone.com/books/earth_science/terc/content/visualizations/es1501/es1501page01.cfm?chapter_no=visuali zation seasonal change in glaciers animation http://www.classzone.com/books/earth_science/terc/content/visualizations/es1501/es1501page01.cfm?chapter_no=visuali zation http://www.uwsp.edu/geO/faculty/lemke/glacial_processes/MoraineMovie.html moraine animation http://www.uwsp.edu/geO/faculty/lemke/glacial_processes/MoraineMovie.html http://www.wwnorton.com/college/geo/animations/glacial_advance_retreat.htm http://www.opb.org/programs/ofg/segments/view/1546 Oregon Field Guide Mt Hood glacier http://www.opb.org/programs/ofg/segments/view/1546
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Cool Glacier Facts Glaciers cover 15 million square kilometers of the Earth’s land surface. About three-quarters of Earth’s freshwater is in glaciers. The world’s largest glacier today is the ice sheet that covers East Antarctica, which in places is over 4200 meters thick. The world’s longest glacier today, the Bering Glacier in Alaska (US), is 204 kilometers long.
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Halifax Harbour, fort built on drumlin
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(1) head of glacier; (2) firn or névé; (3) region of ground moraine deposition; (4) terminal moraine; (5) drumlin; (6) braided stream; (7) kettle; (8) medial moraine; (9) lateral moraine; (10) U-shaped valley; (11) arête; (12) hanging valley; (13) cirque; (14) tarn; and (15) ice fall.
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