Water gets into the rock, freezes, water expands, exerting pressure which weakens the rock and breaks it into smaller fragments
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Abrasion
Debris carried by the glacier scrapes and scratches against other rocks
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Plucking
When the glacier is at a standstill, the ice freezes the rock irregularities. When the glacier advances the sheer force of the glacier pulls the rock with it and plucks material
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Subglacial fluvial erosion
Meltwater flowing at the base of the glacier erodes the rock
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Characteristic of a corrie
A bowl shaped depression with a steep back wall and rock lip
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Formation of a corrie
Freeze thaw weathering causes a nivation hollow, abrasion and plucking occurs deepening the hollow, steepening the back wall. May fill with water to form a tarn
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Characteristic of an arete
A sharp ridge formed where two carries are eroded against each other. Then two adjacent cirques erode, it can wear the rock by freeze thaw and abrasion to make the wall steeper
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Characteristic of a pyramidal peak
A pointed peak forming a steep horn and steep sides.
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Formation of a pyramidal peak
When three or more aretes erode backwards to create one peak
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Characteristic of a Roche mountonee
Ice smoothed rocks with a steeper side facing down valley
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Formation of a Roche mountonee
Stoss side, more resistant rock, is smoothed by abrasion. Lee side becomes jagged due to plucking
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Characteristic of a crag and tail
Large mass of resistant rock on the up valley side and a gently sloping tail of less resistant rock
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Formation of a crag and tail
The softer rock is protected from the large crag, resulting in a steep sided crag and a gentle sloped tail
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Characteristics of striations
Scratches on the bedrock caused by abrasion
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Formation of striations
When the ice moves and the rock is eroded by abrasion, it leaves scratches
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Other cards in this set
Card 2
Front
Abrasion
Back
Debris carried by the glacier scrapes and scratches against other rocks
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