Give at least THREE different glacial erosion processes.
Abrasion, quarrying, fracturing and meltwater erosion.
1 of 18
Name TWO other processes that combine with glacial erosion to make it more effective.
1) Sub-aerial freeze-thaw 2) Mass movement
2 of 18
Explain the link between cirques, pyramidal peaks and aretes.
The headward erosion of cirques on opposing sides of the same mountain mass eventually defines a pyramidal peak. Sharp, knife-like ridges (aretes) will be formed where the headwalls of neighbouring ciruqes meet.
3 of 18
What are the landforms associated with glacial troughs?
Truncated spurs, ribbon or finger lake, hanging valley.
4 of 18
What is a truncated spur?
Original interlocking spurs of winding valley course removed by the cutting of the trough.
5 of 18
What is a ribbon or finger lake?
Ribbon or finger lakes are long, deep basins cut in the trough floor.
6 of 18
What is a hanging valley?
Hanging valleys where a small tributary glacier meets a larger main valley glacier.
7 of 18
Explain what is meant by the term ice sheet scouring.
It is a form of glacial erosion that occurs when ice sheets and glaciers are no longer constrained by mountain valleys. As they spread out the erosive forces are weakened. The net outcomes is a more gentle grinding down of the underlying bedrock.
8 of 18
Explain what is meant by ice-contact depositional features.
Landforms created by direct deposition from a glacier.
9 of 18
Give some examples of ice-contact depositional features.
Moraines, drumlins and till.
10 of 18
What is a terminal moraine?
A terminal moraine is a ridge of moraine extending across a valley and marking the furthest point reached by a glacier.
11 of 18
What is a recessional moraine?
A recessional moraine is one of a series of ridges running across the valley upstream from the terminal moraine and marking the stages in the retreat of a glacier.
12 of 18
Explain how drumlins are thought to have been formed.
Not all drumlins are necessarily formed in the same way. One theory suggests that they are formed by deposition in the lee of a slowly moving obstacle in the deforming layer.
13 of 18
Lodgement till is also know by what other term?
Ground moraine
14 of 18
Name three lowland glacial deposition features.
Till plain, ablation till, lodgement till, erractics
15 of 18
Name the two types of melting taking place in or on a glacier.
Surface melting occurs during summer as a result of insolation and warmer air temperatures, whereas basal melting occurs when the temperature at the base of a glacier is at the pressure melting point.
16 of 18
Name the three types of glacial meltwater flow.
Supraglacial, englacial, subglacial.
17 of 18
Explain the difference between ice-contact and proglacial fluvioglacial landforms.
Ice-contact features are deposited by meltwater within and below a glacier. Proglacial features are made out of fluvioglacial material deposited beyond the ice margin or glacier snout.
18 of 18
Other cards in this set
Card 2
Front
Name TWO other processes that combine with glacial erosion to make it more effective.
Back
1) Sub-aerial freeze-thaw 2) Mass movement
Card 3
Front
Explain the link between cirques, pyramidal peaks and aretes.
Back
Card 4
Front
What are the landforms associated with glacial troughs?
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