Glaciers

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  • Glaciers
    • Masses of ice that fill valleys and move downhill
    • Erode landscapes when the move
      • Plucking
        • Melt water freezes on rock and is pulled out
      • Abrasion
        • Rock on bottom grinds on rock below (sandpaper)
      • Rotational slip
        • Top of glacier, ice moves in circular motion
        • Erodes hollows which deepen to bowel shapes
    • Landforms
      • Arete
        • 2 glaciers, steep sided ridge
        • Striding ridge (lake district)
      • Pyramidal peak
        • 3 or more glaciers
        • Snowdon- Wales
      • Corries
        • Begin as hollows, leaves a tarn
        • Red tarn (lake district)
      • Ribbon lakes
        • form after glacier retreats
      • Truncated spurs
        • Spurs cut off as glacier passes- creates cliff like edges
      • Hanging Valley
        • Formed by small glaciers that flow into larger one
        • When glaciers melt, valley left at higher level
      • Glacial troughs
        • steep sided valleys with flat bottom (V-U)
    • Till
      • Unsorted mixture of rocks, sand...
      • Glaciers transport this- through bulldozing
        • When ice melts, morraines and drumlins form
          • Morraines
            • Lateral, medial, terminal, ground
          • Drumlins
            • Elongated hills
            • round and blunt upstream, tapered and pointed downstream
            • Largest over 1000m long, 500m wide and 50m high
          • Erratics
            • Large rocks that are picked up and deposited
    • Land use
      • Farming (sheep uphill)
      • Forestry for timber
      • Quarrying of slate, limestone...
      • Tourism eg Lake District
      • Causes conflicts
        • Strategies to overcome
          • Resurface paths
          • Reseed vegetation
          • More public transoport
          • Litter signs
          • Encourage tourists to keep dogs on leads/close gates

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