GEOL107 Lecture Notes - Lecture 12: Terminal Moraine, Suspended Load, Aretes
25 Oct 2017
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Document Summary
99. 35% of earth"s water is not a significant source of freshwater (water used for drinking, agriculture, and most industry) Glaciers of ~1meter/day - can surge and move faster (several meters/day) Large masses of ice moving downhill under influence of gravity - move at average rates. At present, glacial ice covers 10% of earth"s surface. Continental glaciers - cover large continental areas (e. g. , antarctica, greenland) Valley glaciers - cover mountainous areas (flow within valleys) Glacial ice is by far best transport agent - competence is huge - capacity is huge. Glacial ice moving downhill erodes large amounts of rock. Glacial erosional features include : u shaped valleys. Cirques - bowl shaped depression, located at some source area of glacier. Horns - triangular to pyramidal shaped mountain peaks caused by glacial erosion on all. Aretes - sharp, razor edge (steep slope - very rapid change in elevation) ridges of rock. Hanging valleys - elevated glacial valleys where former glacier tributaries entered glacial.
