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31 Cards in this Set

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  • Back
valley/alpine glaciers
advance slowly
ice sheets
exist on a larger scale, flow out in all directions
ice shelves
-occur when glacial ice flows into the adjacent ocean
-large, flat masses that extend seaward
-thickest on landward side
ice caps
-cover uplands and plateaus
outlet glaciers
-tongues of ice that flow down valleys extending outward
Piedmont glaciers
-occupy broad lowlands at the bases of steep mountains and form when one or more alpine glaciers emerge fromt he confining walls of mountain tops
-the recrystallization of snow
-the movement of glacial ice
two types of glacial ice
1. plastic flow- movement within ice
2. basal slip- when entire ice mass slips along the ground
Zone of fracture
ice in uppermost zone, brittle
-cracks caused when the glacier moves in irregular terrain
periods of rapid movement
Where do glaciers move the most?
-in areas where more snow falls in the winter then melts during the summer
zone of accumulation
-where snow accumulation and ice formation occur
-outer limits of zone accumulation
-when large pieces of ice break off in front of the glacier-creates icebergs
glacier budget
-balance or lack therof between accumulation of upper end and loss at lower end
When are glaciers stationary?
-when ice accumulation excedes ablation and glacier front advances until the two factors balance
When does a glacier retreat?
-if a warming trend increases ablation and/or if a drop in snowfall decreases accumulation
loss at lower end of glacier
rock flour
-pulverized rock produced by glacial "grist mill"
glacial striations
-scratches and grooves in glaciers
glacial trough
-U shaped (wide and deep)
hanging valleys
-when glaciers recede, valleys of tributary glaciers are left standing above the main glacial trough
pater noster lakes
-when depressions on valley floor are filled with water
-bowl shaped depression with walls on three sides
-deep, steep sided inlets of the sea, present at high altitudes
-sharp edged ridges, come from enlargement of cirques
roche moutonee
-an asymmetrical knob of bedrock, formed when glacial abrasion smoothes gentle slope and plucking steepens the opposite side
How do glaciers form?
-from accumulating ice that gradually turns into snow
ice plucking
-when rock and debris get frozen onto the ice and pulled up