Glaciers: who, what where…. Aped valeys 1.Animated tutorial on formation and deformation, includes different types of glaciers.

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Presentation transcript:

Glaciers: who, what where…

Aped valeys 1.Animated tutorial on formation and deformation, includes different types of glaciers. onal%20Materials/Documents/elearning/module13swf.swf onal%20Materials/Documents/elearning/module13swf.swf 2.McGraw Hill list of four animations hill.com/sites/ /student_view0/chapter12/animations_and_movies.html# hill.com/sites/ /student_view0/chapter12/animations_and_movies.html# 3.Computer animation of glacial erosion of v shaped valleys into u shaped valleys

Glaciers: Rivers of Ice

Bering Glacier, Alaska

How do glaciers form?

Snow accumulation > Snow melt

Layers of snow accumulation, density changes.

Crystals start to form.

Snow under compression --- Ice crystals result.

Dense (compacted, crystallized) glacial ice looks blue.

How do glaciers flow like rivers?

Glacial Deformation

Crevasse near Hogsback

How do glaciers move? How do crevasses form?

When glaciers retreat…

Moraine Lake

Eliot Glacier Retreat and Moraines

Fault

Lateral moraines

Unsorted sediments

Lyman Glacier, Ranier

Pac NW Past Glaciation

Puget Sound is the result of a glacier

Mount Hood Glaciers and stream levels

Eliot Glacier 1901,2005

White River Glacier

0and%20Moraine.swf Start here. 0and%20Moraine.swf hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/ /30425/12_03.swf::Fig Cross-section of an Ice Sheet polar iglacier animation hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/ /30425/12_06.swf::Fig Glacier Basics animation of general glacier hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/ /30425/12_08.swf::Fig Ice Flow in a Glacier ice flow animation hill.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/ /30425/12_09.swf::Fig Crevasses on a Glacier Crevasse foirmation zation seasonal change in glaciers animation zation moraine animation Oregon Field Guide Mt Hood glacier

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.

Halifax Harbour, fort built on drumlin

(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.