GEOL 1 Lecture Notes - Lecture 18: East Antarctic Ice Sheet, Isostatic Depression, Sea Level Rise
21 Sep 2020
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Document Summary
Meltwater lakes on top of glaciers causing some to crack/break. Additional weight causes ice to bend and then fracture. Melt all glaciers = sea level rise of around 65 m (200 ft) Depressing surface under weight of a glacier (effects crust/mantle) East antarctic ice sheet has caused up to 2. 5 km of isostatic depression. Crust comes back up to original position once ice is removed. Currently covers around 9 percent on earth"s land area. Ice on antarctica exceeds 4,200 m (2. 5 miles) in max thickness. More dense than when snow first falls. Antarctica isn"t made of ice but has a thick glacier sitting on top. A boundary between the zones of accumulation and ablation. Center of glacier is moving faster b/c edges are in contact with rocks creating friction. Pressure created on bottom layer to move in a ductile manner. Thin sheet of water or ice between ground and glacier so this moves at a high speed.
