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glaciers
all about glaciers
27
Geology
Undergraduate 1
05/04/2008

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Cards

Term
Moraine
Definition
a pile of debris that has been transported and deposited by a glacier
Term
Esker
Definition
a ridge of sorted sediment and gravel deposited in sub-glacial melt water tunnels
Term
Kettle Lakes
Definition
water filled depression left by a glacial ice block
Term
Erratics
Definition
boulders left on the surface
Term
Drumlins
Definition
elongated hills formed when a glacier overrides a glacial till
Term
Outwash Plains
Definition
sand and gravels deposited by glacial melt water
Term
Horn
Definition
a pyramid-like peak formed by glacial action in 3 or more cirques surrounding a mountain summit
Term
Aretes
Definition
a narrow, knifelike ridge separating 2 adjacent glaciated valleys
Term
Hanging Valley
Definition
a tributary that enters a glacial trough high above the floor of the trough
Term
Truncated Spurs
Definition
eroded triangular shaped cliffs in glaciated valleys
Term
Tarn Lakes
Definition
a small lake in a cirque
Term
Cirque
Definition
an amphitheater-shaped basin at the head of a glaciated valley
Term
U-Shaped Valley
Definition
glacial trough
Term
Till
Definition
material depostited directly by the glacier
Term
Sorted Sediment
Definition
material laid down by glacial melt water
Term
Glacier
Definition
- A thick ice mass that originates on land from the accumulation, compaction, and recrystallization of snow
Term
Mountain Glacier
Definition
Smaller than continental, covers only a small region, lengths greater than widths
Term
Continental Glacier
Definition
Covers 10% of earth’s land, bigger than mountain glaciers
Term
Internal Movement
Definition
rotation of grains, slipping along weak surfaces, melting and refreezing
Term
External Movement
Definition
basal slip (slipping on a layer of water between the ice and bedrock)
Term
Mountain Glaciers
Definition
tend to accentuate the landscape
Term
Continental Glaciers
Definition
Tend to subdue the landscape
Term
Wisconsinan
Illinoian
Pre-Illinoian
Definition
stages of glaciation in illinois
Term
The North
Definition
where glaciers advance from
Term
Eccentricity of orbit
Changes in earth’s tilt
Precession of the equinoxes
Definition
the 3 parts of Milakovitch's Theory
Term
Areas where the summer climate is too cold for all the snow to melt
Definition
this is where glaciers form
Term
The middle of the glacier
Definition
where within the glacier the movement is faster
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