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Unformatted text preview: AMOUNT AND RATE OF GLACIER EROSION Narrow ice streams (10s km) Yosemite Valley - 450 m Fjord in Norway -> 1000 to 2000 m 900 m basins down at the heels profile Wide ice streams (100s km) Great Slave Lake -> 600 m Great Bear Lake -> 400 m Lake Michigan -> 300 m; -60 asl Laurentide ice sheet (1000s km) drift thick -> average of 10 m low due to low relief and hard rocks with clay perhaps as much as 120 m rates of erosion 0.5 to 5.0 mm per year (1.0 mm average) PRODUCTS OF GLACIER EROSION Small scale striae and striations whalebacks glacial grooves roches moutonnees friction cracks rock drumlins Large scale U shaped valleys cirques spurs arete s tarns horn paternoster lakes col hanging valleys trimline...
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- Spring '08