Erosional landforms

Erosional landforms formed by glaciers

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  • Created by: emily_w
  • Created on: 07-05-14 16:18
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  • Erosional Landforms
    • Arete
      • two glaciers erode the rock between them, forming a steep, narrow ridge
      • separates 2 U-shaped valleys
      • Image
    • Pyramidal peak
      • glaciers are not often found alone
        • can be 3 on one mountain
      • glaciers erode backwards into each other
      • rock between each glacier is an arete
      • forms a pyramidal peak
      • The Matterhorn, Switzerland
    • U-shaped valley/glacial trough
      • powerful glaciers can erode whole valleys
      • U-shaped valleys have steep sides and a flat floor
      • plucking takes place on the sides, making them steep
      • abrasion happens on valley floor, making it flat
    • Corrie
      • less erosion at snout of glacier, moraine deposited
        • rock scooped out through rotational erosion
          • at the start of a glacial period, snow collects in a shallow dip in the mountainside
          • forms a small corrie glacier
        • creates raised lip of rock
      • rock scooped out through rotational erosion
        • at the start of a glacial period, snow collects in a shallow dip in the mountainside
        • forms a small corrie glacier
      • lip traps meltwater when glacier melts, forming corrie lake
        • less erosion at snout of glacier, moraine deposited
          • creates raised lip of rock
        • can also be called a tarn, cirque or cwm
      • corrie lakes are very deep and have a steep back wall
      • corrie in the Lake District
    • Truncated spurs
      • valleys have interlocking spurs before the glacier
      • rivers cannot erode hard rock, so they wind around it to form interlocking spurs
      • glaciers can erode hard and soft rock
      • after erosion, interlocking spurs are left truncated
      • truncated spurs
    • Hanging valley
      • Big rivers have tributaries
      • glaciers make the valley deeper and wider, leaving tributaries hanging
      • waterfalls created after glacier melts
      • Hanging valley in Yosemite national park
    • Ribbon lakes
      • glaciers find it difficult to erode soft rock but can easily erode hard rock
      • rock basin formed when soft rock eroded
      • water trapped in rock basin when glacier melts
      • if moraine is deposited, it will help dam the lake
      • ribbon lake
  • Image
  • Corrie
    • lip traps meltwater when glacier melts, forming corrie lake
      • can also be called a tarn, cirque or cwm
    • corrie lakes are very deep and have a steep back wall
    • corrie in the Lake District

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