Erosional landforms part 1

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  • 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
      • Where 3 or more arete's meet - glaciers have curved away at the top of a mountain to create a sharp summit
      • Mont Blanc
      • 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
    • 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
      • 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


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