BSC 435 Study Guide - Final Guide: Glacier, Terminal Moraine, Atmospheric Circulation
Document Summary
A thick ice mass that originates on land from the accumulation, compaction, and recrystallization of snow. Internal movement- rotation of grains, slipping along weak surfaces, melting and refreezing: 200 meters/year. External movement: basal slip- a layer of water between glacier and bed rock so its slip along the surface. Describe the types and locations of glacial sediment. Drift- water deposited on land or water as result of glaciation. Glacial till- material directly deposited by glacier (not sorted) Moraine- pile of debris carried & deposited by glacier. Terminal moraine- debris that is pushed in front of the glacier. Erratic- large boulders transported by glaciers and left on the surface. Outwash- small materials like sand and gravels deposited by glacial melt water. Kettle lake- water filled depression left by glacier. Drumlin- elongated hill formed when a glacier overrides till. Hanging valley- a tributary that enters glacial trough high above trough floor. Ar tes- a narrow, knife-like ridge, separating two valleys.
