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18 Cards in this Set

  • Front
  • Back
Within a glacier, what is the primary force driving its motion?
gravity
What does sea level change have to do with past glaciations?
glaciations greatly affect sea level and the amount of fresh water in the ocean

When glaciers become smaller and melt, sea level rises
What kinds of continental glacier features have been left in Indiana, especially as the glaciation receded
Recessional or terminal moraines

Glacial Till

U shaped valleys

Glacial erratic (big random rocks)
Landscape Features of Continental Ice Sheets
Ice sheet
Till
Ice shelf
polished surface
Evidence Left Behind by Glaciers
Glaciers carve into land and deposit sediment

U shaped valleys

Striations

Glacial erratic (big random rocks)
zone of accumulation
Glacier forms where accumulation of snow and ice exceeds the amount lost due to melting and other processes
A little south of zone of accumulation
Glacier loses ice and snow by melting, wind erosion, and sublimation
Equilibrium line:
The losses of ice and snow exactly balance the amount of accumulation
Zone of ablation
south of equilibrium:
ice melts away faster than it can be replenished, causes the glacier to end or terminate
What conditions are needed for the terminus of a glacier
ice melts away faster than it can be replenished
glacier colors
White high up
Blue low down, blue ice in zone of ablation
Sublimation:
solid going directly to vapor
Lateral Morane
Forms along the side of the glacier and is expressed as a dark fringe along the edge of the glacier. When the glacier melts, they form low ridges along the edges of the valley
Moraine
seidment edposited by a glacier over the edges and the base
Medial Moraine
Sediment rich belt in the center of the glacier, represents where two glaciers joined, trapping their lateral moraines within the combined glaciers
Terminal Moraine
Forms at termination of glacier, marks glacier's furthers downhill extent, large and conspicuous
Glacial erratics and striations evidence of past glaciers
They show that glaciers were present because they are the only things large enough to move erratics and create straitions draging such large sediment
Glacial Till
accumulate as glaciers move, they pick up and carry sediment

accumulates in piles, sheets, and ridges forming landforms called moraines