GEOG 1300 Lecture Notes - Lecture 12: Patterned Ground, Landform, Frost Heaving
21 Apr 2016
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Document Summary
77% freshwater frozen a large mass of ice resting on land or floating as shelf in sea adjacent to land not frozen lakes or groundwater ice. Alpine glaciers: glacier in a mountain range (alps of central europe, subtypes. Cirque: bowl shaped recess at head of valley. Tidewater: glacier ends in body of water influenced by tides. Stage 2: in winter, old snow is slowly pressured and recrystallized into firn: firn: intermediate stage b/w snow and glacial ice, compact and granular texture. Stage 3: many years, dense glacial ice forms in analogous process to the metamorphic process: snow and firn are pressured and re-crystalized into dense glacial ice (metamorphic rock) Annual mass balance determines location of equilibrium line. Water presence in basal layer can lubricate the glacial movement. Ice regulation speeds up downslope movement b/c rock debris are frozen into ice and friction b/w the basal layer and bedrock reduced.
