glaciers part 1

glaciers part 1 - Chapter 19 20 and 22 April 2010 Glacial...

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Glacial Modification of Unit Outline : Introduction Pleistocene ice extent Types of glaciers Glacier formation & movement Effects of glaciers Mountain glaciers (erosion and deposition) Continental ice sheets (erosion and deposition) Periglacial Chapter 19 20 and 22 April 2010 People and the Environment Disintegration of Antarctic Ice Shelves (p. 559) Focus Shrinking Alaskan Glaciers (p. 573)
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Introduction
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Introduction: Glaciers and the Landscape ALL FYI… Glaciers significantly reshape the landscape ~7% all contemporary erosion is from glaciers (10x rate increase when glacier present on mountain)
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Introduction: Pleistocene Ice Extent Pleistocene epoch alternated between glacial and intergalcial periods (18- 19 times) Maximum glacial during Wisconsin glaciation at Pleistocene epoch end Figure
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Introduction: Figure FYI: 1/3 land surface covered by ice Most extensive = Laurentide in Canada and north USA
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Introduction: Present-Day Ice Figure FYI: 10% Earth’s land surface; 96% all present-day ice in Greenland & Antarctica FYI: Some ice here is 13,000 feet thick! http://www.youtube.com/watch?v=yHTWDBF_6ZY
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Figure Introduction: Present-Day Ice Extent
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Introduction: Types of Glaciers Continental Ice Sheets Highland Icefield Alpine Glaciers Mountain Glaciers Perennial ice masses “Finely tuned environment with a delicately balanced nourishment budget…”
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Introduction: Types of Glaciers Mountain glaciers: Alpine glaciers Individual, confined systems Valley glaciers much more common compared to piedmont glaciers Figure 19-
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glaciers part 1 - Chapter 19 20 and 22 April 2010 Glacial...

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