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Large mass of perrenial ice formed by accumulation and recrystallization of snow, which flows slowly under pressure of its own weight and pull of gravity
Glacier confined to a mountain valley
Carved by rivers
carved by glaciers
Valleys carved by tributary glaciers that are high above the glaciated valley floor
Waterfall coming out of a hanging valley
Pyramidal, sharp-pointed peak
Scooped out basin at a head of a glacier valley
- Small mountain lake collects ina cique basin
- ex: Jenny Lake
String of small lakes down a glaciated valley
high pass of saddle-like narrow depression formed by two cirques
Accumulation of unsorted glacial debris (soil and rock)
There are two types of glaciers; what are they?
- 1. Alpine glaciers
- 2. Continental glaciers
What is an Alpine glacier?
- It is ice accumulation in mountains.
- Ex: Valley, Cirque
What are continental glaciers?
- Ice sheets, ice caps
- Ex: Greenland, Antarctica
Glaciers vs. Snow
- Glaciers: vs. Snow:
- - Recrystalize - Not as dense
- - Dense ice - Doesn't flow
- - Move, flow
What mechanisms, besides gravity, do glaciers need to move?
- 1. Plastic flow (cold-base glaciers)
- 2. Basal slip (warm-base glaciers)
Where glacier moves over steps in bedrock topography and where it curves; cracking and breaking
very fine sediment, chalky
What are the three types of erosion that are caused by glaciers?
- 1. Ice push
- 2. Abrasion
- 3. Plucking
What occurs during the process of ice push?
As glaciers move they push debris to the side, front, or out of the way.
What occurs during the process of abrasion?
Rocks grinding on other rocks; creates glacier polish
What occurs during the process of plucking?
- Large material being stuch in glacier and moving with it.
- (big boulders)
What evidence proves glaciation?
(What are the three types?)
- 1. Glacial Polish
- 2. Striations
- 3. Depositional
What is a moraine?
Where a river used to be.
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