GLACIERS

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GLACIERS
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What is a glacier
A thick body of ice that is either moving or has
shown evidence of movement in the past.
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How do glaciers form
90 air
60 air
10 air
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Where do glaciers form

• high elevations
• high latitudes

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How do glaciers move

• By a combination of
• sliding
• internal flow within ice crystals

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How fast do glaciers move
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Snow line
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crevasses
bergschrund
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Types of glaciers
Continental
Alpine (valley)
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How do glaciers erode
by plucking and grinding
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Silverton typical erosional features of
formally glaciated terrain
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U-shaped Valley
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U-shaped valleys
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Fjord Norway
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U-shaped Valley
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Hanging valley w/ bridalveil falls
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Truncated spur
Hanging valley
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Formation of a roche moutonee
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Roche moutonee Coal Bank Pass
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How do glaciers transport
Moraine is a term used for both transported and
deposited material

• Types of moraines
• terminal or end
• lateral
• medial

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Terminal moraines
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Lateral moraines
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Medial moraines
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Medial moraines
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What do glaciers deposit
Drift is the generally term for anything
deposited directly or indirectly from glacial
action it consists of

• till unsorted material deposited directly a
  glacier
• outwash sorted material deposited by glacial
  meltwaters

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Till
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Outwash gravel
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Outwash terraces
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Continental glacial features
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Esker
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Kame
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Drumlins
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Kettles
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Why does the earth experience ice ages

• plate tectonics
• Milankovitch cycle

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Maximum extent of ice sheets in Northern
Hemisphere during Pleistocene ice age
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Eccentricity (100000 year cycle)
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Obliquity (41000 year cycle)
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Precession (26000 year cycle)
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