Erosional landforms part 1
- Created by: darcie_cl
- Created on: 26-02-14 19:32
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- Landforms of erosion
- CORRIE
- An arm-chair shaped hollow with a steep back wall. Often occupied by a lake called a tarn
- Formation
- 1. freeze thaw beneath snow
- 2. Meltwater washes away weathered rock
- Nivation hollow gradually enlarges. Firn gradually becomes glacier ice
- Plucking steepens back wall
- Abrasion by angular rocks over deepens basin
- ARETE
- Two neighbouring corries run back to back. Each glacier erodes its side of the ridge
- Glacial erosion on both sides of the ridge - HEADWARD EROSION
- Edge becomes steeper and ridge becomes narrower
- Lake District Helvelyn
- 950m high - 1km long
- Two neighbouring corries run back to back. Each glacier erodes its side of the ridge
- PYRAMIDAL PEAK
- Where 3 or more arete's meet - glaciers have curved away at the top of a mountain to create a sharp summit
- Mont Blanc
- GLACIAL TROUGH - VALLEY
- A steep-sided, flat-floored valley
- Formation
- Steep sides; plucking and abrasion, till being carried in the glacier and boulder clay is deposited on valley floor
- Ice melts and retreats - valley is left steep sided
- Flat base; plucking and abrasion. As ice melts valley is left with a wide base
- Starts off as freeze thaw
- Steep sides; plucking and abrasion, till being carried in the glacier and boulder clay is deposited on valley floor
- Truncated spurs
- A blunt ended, sloping ridge descending from the side of a glacial trough
- Abrupt determination due to glacial ice erosion
- Devils Point on Cairn Toul
- 400m high
- HANGING VALLEY
- A side valle that enters a U-Shaped valley at an eevation high above the main valley floor
- Creates cascading waterfalls
- The tributary valley has a smaller volume of ice and mass = less erosional power
- Erosion is less deep and wide
- Milford Sound - New Zealand
- 270m above valley floor
- A side valle that enters a U-Shaped valley at an eevation high above the main valley floor
- CORRIE
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