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Formation of Glaciated Features

Glacial Erosion Features

1. Cirques
2. Arêtes and Pyramidal Peaks
3. Glacial Troughs with rock steps, truncated spurs, hanging valleys, ribbon
lakes, fjords
4. Striations
5. Roche mountonees
6. Scouring of surfaces e.g. large scale in lowland areas

Glacial Deposition Features

1. Erratic
2. Moraine ­…

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Snow collects in a pre-glacial hollow, more accumulates turning it into ice. Freeze thaw steepens
the back wall. Plucking removes rock from the headwall. Abrasion removes rock from the bottom
of the headwall, causing a deep thick basin.
Rotational slip means there is greater pressure from the ice at the…

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high velocity due to the high pressure. The coarsest and heaviest materials (gravel etc) are
deposited first, closest to the ice margin and the finer materials are carried much farther down
the valley (clay deposited last).

2. Prolonged drift, varves, lake deltas
Prolonged drift consists of material that is dropped…

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the glacial fluvial deposits left by meltwater streams. When the ice melts they leave enclosed
depressions which often fill with water to form kettle hole lakes. E.g. Western Greenland in
Isunngua Highlands.

Periglacial Features

1. Patterned Ground
Found in Periglacial areas, it is the appearance of lines and polygonal stones…

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fossil ice wedge cast if sand and gravel is washed into the wedges e.g Long Hanborough Carrot nr
Oxford.

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