SEE: Glaciation 2A.7C: Lowland erosional landforms
- Created by: MaggieNaylor
- Created on: 06-03-22 14:19
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- 2A.7C: Erosional LOWLAND landforms
- Ice sheet scouring
- Process of erosion that occurs when ice sheets flow over lowland
- Roche-moutonnees
- Stoss= upstream Loss= downstream
- Stoss side
- 1. Glacier hits obstacle that is too large to be plucked, so moves over it
- 2. By hitting the obstacle, pressure and friction increases so ice melts
- 3. This metlwater allows the glacier to slide over the rock
- 2. By hitting the obstacle, pressure and friction increases so ice melts
- There are striations as smaller rocks abrade the surface
- This is due to abrasion because of the meltwater
- 1. Glacier hits obstacle that is too large to be plucked, so moves over it
- Lee side
- 1. As the glacier reaches the lee side, friction and pressure drops
- 2. This causes the meltwater to refreeze
- 3. It then sticks to the outcrop, and plucks smaller pieces of rock
- 4. This leaves a jagged surface on the lee side
- 3. It then sticks to the outcrop, and plucks smaller pieces of rock
- 2. This causes the meltwater to refreeze
- 1. As the glacier reaches the lee side, friction and pressure drops
- EXAMPLE: Myot Hill, Scotland
- Bare outcrop of rock sculpted by erosion
- Can be 5-30m tall
- Knock and lochan
- Lowland landscape of bare, ice sculpted hills (knocks) and small lakes (lochans)
- 1. Areas of resistant rock are unable to be eroded, forming the knocks
- 2. Selective, deeper erosion of faults and weaker areas of rocks form the lochans
- Different geology plays a key role
- 2. Selective, deeper erosion of faults and weaker areas of rocks form the lochans
- EXAMPLE: Isle of Lewis, Scotland
- Crag and tail
- A landform consisting of a rock hill and tapering edge
- 1. A resistant object prevents flow of the glacier (the crag)
- 2. Ice is forced around the obstacle, eroding the rock around it
- 3. This eroded material is then deposited on the lee side to form the tail
- 2. Ice is forced around the obstacle, eroding the rock around it
- EXAMPLE: Castle Rock (crag) and Royal Mile (tail) Edinburgh
- Ice sheet scouring
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