Ice thicker than topography ice flows in direction of

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• Ice thicker than topography. • Ice flows in direction of slope of the glacier. • Greenland and Antarctica - 3000 to 4000 m thick (10 - 13 thousand feet or 1.5 to 2 miles!) Iceland Vatnajokull Ice Cap, Iceland
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Glaciers - Geomorphic Agents • Glaciers are highly effective agents of erosion. • Abrasion - rock debris embedded in base of ice. • Polishing, grooves and striations. • Plucking / Quarrying - removal of large chunks of rock debris. Glaciers - Erosional Landforms • Cirque - semicircular hollow with steep headwall carved by glaciers into an alpine valley head.
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Tarn Glaciers - Erosional Landforms • Arete - steep, knife-edge ridge between glacial valleys. • Col - gap in an arete where two cirques meet. • Horn - steep peak carved out by cirques. Aretes, horns, cols - Mt. Everest
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Glaciers - Erosional Landforms • Glacial trough - wide, parabolic valley carved by ice flow (also called a “U-shaped” valley.
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Paternoster Lakes - chains of lakes created by recessional moraines.
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Yosemite Valley, California Norway Hudson River Fjiord - glacially carved valley flooded by the sea. Striations - linear glacial scratch marks on bedrock.
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Chatter marks - percussion fractures Glaciers - Geomorphic Agents • Tunnel Valley • Tunnel eroded into landscape by flowing subglacial meltwater. • Tunnel valleys may form networks of interconnected segments. • Tunnel valleys can trend uphill or downhill because they are carved by water flowing under pressure. Tunnel Valleys - Kawartha Lakes, central Ontario, Canada
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Glaciers - Geomorphic Agents • Glaciers are highly effective agents of deposition. • Drift - rock debris deposited by glaciers. • Till - Nonstratified, poorly sorted drift deposited directly from glacial ice.
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  • Fall '12
  • JBRETBENNINGTON
  • Geomorphology, Glacier, Glaciology, snow falls, Glacier Bay Ice Fields

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