GEOG 120 Lecture 2: Geog 12/10
5 Feb 2019
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Document Summary
Streams have greater flow with greater precipitation leads to v-shaped deep valleys leads to u-shaped wide valleys. Alpine glaciers as effective agents of erosion in mountains. Glaciers weather rock by abrasion and plucking. Glaciers transport eroded material as it flows over the landscape or from valley walls. Debris carried on surface of glacier, buried within ice, or beneath glacier. Glacial till: unsorted, unconsolidated material of different sizes. Erratic because do not match local geology. Low oval mound or small hill formed from glacial till. In wisconsin, the land has rebounded 50 m since the ice age glaciers receded. Meltwater has greater flows in midsummer from melting ice. Changes in sea level: lowered 120 m. Land exposed by drop in sea level. Land created under ice by drop in sea level. A lot has changed in a relatively short amount of time. Today"s ghg levels are greater than in the past 800,000 years.
