Earth Sciences 1022A/B Lecture Notes - Lecture 15: Outwash Plain, Moraine, Iceberg
27 Nov 2015
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Document Summary
Ice sheet: continental scale, radial flow from a central area. Valley: in mountains, flow down valleys by gravity. Ice sheet-round and radial flow goes from middle, outwards. Upper brittle zone of fracture rides passively on lower deforming plastic zone that may also slide over the glacier"s bed. Figure 11. 6 vertical cross-section through a glacier illustrating ice movement. Figure 18. 11 zone of accumulation and zone of wastage. Abrasion: rock debris in glacier"s sole grind, scrape, scour rock. Cirques: rock bowls at heads of valley glaciers. Figure 11-9 erosional landforms created by alpine glaciers. Till: stony mud with striated and polished stones. Main material in moraines and drumlins that form along the edge of or under the glacier. Stratified drift: sand and gravel from melt-water; forms . Kame: mound lowered from glacier"s surface on melting. Sand and gravel is inside the winding tunnel.
