GEO 101 Lecture Notes - Lecture 14: Louis Agassiz, Sea Ice, Glacier Morphology
12 Apr 2018
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Glaciers: glaciers, ~(cid:1006)% of (cid:449)orld"s (cid:449)ater i(cid:374) gla(cid:272)iers, antarctic ice sheet, 80% of (cid:449)orld"s i(cid:272)e, ~(cid:1006)/(cid:1007) of earth"s fresh (cid:449)ater, 1. 5 times area of ua. Ice carried and dropped: erratic boulders, fine-grained unsorted soil, whe(cid:374) first proposed, agassiz"s idea (cid:449)as (cid:272)riti(cid:272)ized, by the 1850s, many geologists agreed that he was right, agassiz saw evidence for a north american ice age. Ice ages: glaciers presently cover ~10% of earth, during ice ages, coverage expands to 30, the most recent ice age ended ~11 ka, covered new york, montreal, london, paris. Ice sheets were hundreds to thousands of meters thick. In polar regions, glaciers form at sea level. Ice flows outward from thickest part of sheet: greenland, antarctica, movement of glacial ice. In polar regions, glaciers flow out over ocean water: tidewater glaciers valley glaciers entering the sea, sea ice non-glacial ice formed of frozen seawater.
