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21 terms

Glaciers

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arête
a sharp, narrow ridge between adjacent valleys that was formed by glacial erosion.
basal slip
movement of the entire mass of a glacier along the bedrock
cirque
a steep-walled semicircle depression eroded into a mountain peak by a glacier
crevasse
a fracture or crack in the upper 40-50 meters of a glacier
fjord
a long, deep, narrow arm of the sea bounded by steep walls, generally formed by submergence of a glacially eroded valley
glacial striation
parallel grooves and scratches in bedrock that form as rocks are dragged along at the base of a glacier.
horn
a sharp, pyramid-shaped rock summit where three or more cirques intersect near the summit
ice fall
a section of a glacier that flows down a steep gradient, so that the ice fractures into numerous crevasses and towering ice pinnacles
iceberg
a section of a glacier that flows down a steep gradient so that the ice fractures into numerous crevasses and towering ice pinnacles
paternoster lake
one of a series of lakes, strung out like beads and connected by short streams and waterfalls, created by glacial erosion
plastic flow
(a way for glaciers to move) ice flows like a liquid
snow line
the altitude on an alpine glacier about which there is permeable snow. the boundary between the zone of accumulation and the zone of aldation.
tarn
a small lake at the base of a cirque
terminus
the end, or foot, of a glacier
zone of ablation
the lower-altitude part of an alpine glacier where more snow melts in the summer than accumulates in winter.
zone of accumulation
the higher-altitude section of an alpine glacier where more snow falls in winter than melts in summer, and where snow accumulates from year to year
calving
when a glacier flows into an ocean and large chunks fall off
plucking
when a glacier picks up chunks of rock
kettle lake
glaciers that had chunks of the glacier break off then melts creating lakes
esker
the thin mound of till from stream running under a glacier
erratic
a boulder that was transported to its present location by a glacier. usually different from the bedrock in its immediate vicinity.

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