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GGR100H1 (41)
Chapter 17

Chapter 17- Textbook

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Department
Geography
Course
GGR100H1
Professor
Joseph Leydon
Semester
Winter

Description
Chapter 17- Glacial and Periglacial Processes and Landforms 01:55 Rivers of Ice A glacier is a large mass of ice resting on land or floating as an ice shelf in the sea adjacent to land They form by the continual accumulation of snow that recrystallizes under its own weight into an ice mass They move slowly under the pressure of their own great weight and the pull of gravity They move slowly in streamlike patterns, merging as tributaries into large rivers of ice Glaciers form in areas of permanent snow, both at high latitudes and at high elevations at any latitude A snowline is the lowest elevation where snow can survive year-round; specifically it is the lowest line where inter snow accumulation persists throughout the summer Apline Glaciers Glacier in a mountain range is an alpine glacier or mountain glacier Alpine glaciers form in several subtypes One prominent type is valley glacier, literally a river of ice confined within a valley that originally was formed by stream action As valley glacier flows slowly downhill , the mountains, canyons and river valleys beneath its mass are profoundly altered by its erosive passage Some of the debris created by glaciers excavation is transported on the ice, visible as dark streaks and bands being transported for deposition elsewhere Most alpine glaciers originate in a mountain snowfield that is confined in a bowl-shaped recess This scooped-out erosional land form at the head of a valley is a crique A glacier that forms in a cirque is a cirque glacier, several cirque may jointly feed a valley glacier Several valley glaciers pour out of their confining valleys and coalesce at the base of a mountain range, a piedmont glacier is formed and spreads freely over the lowlands A tidal glacier such as the Columbia Glacier on Prince William Sound ends in the sea, calving to form floating ice called icebergs Icebergs usually form wherever glaciers meet the ocean Continental Glaciers A continuous mass of ice is a continental glacier In its most extensive form it is an ice sheet Two additional types of continuous ice cover associated with mountain locations are ice caps and ice fields An ice cap is roughly circular and by definition covers an area of less than 50,000km^2 An ice field is not extensive enough to form the characteristic dome of an ice cap instead it extends in a characteristic elongated pattern in a mountainous region Continuous ice sheets or ice caps are drained by rapidly moving solid ice streams that form around their periphery , moving to the sea or to lowlands An outlet glaciers flows out from an ice sheet or ice cap but is constrained but a mountain valley or pass An ice shelf is a thick sheet of ice with a gently undulating to level surface that extends over the sea and floats on water www.notesolution.com
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