Glaciers - Geosc 10 Thursday March 25th 1999 Announcements...

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Geosc 10 Thursday March 25th, 1999 Announcements: Exam is Thursday April 1st. Lecture notes: I. Preview A. Glaciers --mass of snow or ice that deforms and moves; glacial ice can be extremely thick or not thick at all 1. Erosion of glaciers --occurs in two ways a. Freezing and thawing b. The flow of ice itself 2. Transport of glaciers --occurs either in or on the glacier 3. Deposition of glaciers B. Plastic flow/creep --the way a glacier moves C. Temperature greater than or equal to 0.8 T melt (temperature glacier melts) II. Erosion and transport A. When we talk about glacial erosion or transport we mean mechanical weathering only 1. Freeze-thaw--seep into cracks, freeze then expand 2. Cold B. Not chemical weathering which is a mineralogical change from primary to clay 1. Involves the release of cations (K, Na, Ca, Mg) 2. Si to rivers then to the sea II. Plastic flow/creep (Temperature greater than or equal to 0.8 T melt (80% melting temperature) A. The glaciers are close to their melting temperatures therefore we think that
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