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Glacier:move,ero,dep
| Term | Definition |
|---|---|
| till | unsorted material deposited by glacier (large) |
| stratified drift | Sediments deposited by glacial meltwater that are sorted and layered (small) |
| glacial erratics | piece of rock that differs from the size and type of rock native to the area in which it rests. |
| glacier | dense ice sheet that slides down a slope due to gravity |
| alpine glacier | glacier that started in a bowl shaped mountain cavity (cirque) and flows into a valley |
| piedmont glacier | a valley glacier that slides down into a plain |
| icecap | covering of ice over a large area |
| plastic flow | movement within the ice; beneath zone of accumulation and zone of wastage and zone of fracture |
| zone of fracture | Upper 30 - 60 meters ; brittle behavior; the ice breaks rather than undergoing gradual permanent distortion and flow |
| zone of accumulation | where snow and ice form; snow accumulates faster than it melts; above equilibrium line; front |
| zone of wastage | below equilibrium line; ice and snow melt faster than the accumulate; toe |
| crevasse | zone of fracture; caused by tension when when moving over irregular terrain; cracks in ice |
| ablation | loss of snow at lower end of glacier (zone of wastage) |
| calving | large pieced of ice break off of front of glacier; creates ice bergs |
| ice berg | floating pieces of ice |
| firn | stage between snow and permanent ice |
| glacial retreat | glacier shrinks |
| glacial advance | glacier grows |
| equilibrium line | where the amount of new snow gained by accusation is equal to the amount of snow lost by abrasion; moves up in the summer and down in the winter |
| plucking | meltwater penetrated the cracks and joints along the rock floor of the glacier and freezes; erosion and transportation of large chunks of rock |
| abrasion | ice and load of rock fragment slide over bedrock, and smooth, crape, and polish the bedrock; erosion that occurs when the particles scrape against each other |
| glacial striations | scrapping of glacier; formed by abrasion |
| u-shaped valley | also known as glacial trough |
| trough | glacier widen, deepen, and straighten valley, |
| hanging valley | after ice has redeemed, valleys of smaller tributary glaciers are left standing above the main glacial trough |
| cirque | bowl-shaped depression |
| arete | sharpe-edged ridges; line of sharp pyramid like peaks |
| horn | pyramid like peak that projects above surrounding |
| fjord | steep sided inlets of sea; a long, narrow, deep inlet of the sea between high cliffs |
| glacial flour | rock in a powdery form caused by glacial erosion; the bottom go the glacier rubs across the bedrock layer, eroding the softer material |
| tarns | mountain lake or pool formed in a cirque excavated by a glacier |
| paternoster lakes | one of a series of glacial lakes connected by a single stream or a braided stream system of cirques |
| morain | glacially formed accumulation of unconsolidated glacial debris (soil and rock) |
| terminal or end morain | farthest advance of glacier(moraine) |
| lateral morain | along the side (moraine) |
| medial morain | (moraine) 2 valley glaciers intersect to form one ice stream |
| esker | remain of river that ran underneath a glacier; winding ridge of stratified sand and grave |
| kettles | large piece of ice breaks off a glacier as it moves; leaves depression such as lake |
| drumlin | elongated hill in shape of egg; formed from glacier moving over till |
Created by:
miabegic2
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