River valley

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  • Created by: c.low
  • Created on: 05-05-15 13:49
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  • Erosion
    • Hydraulic action
      • water breaks down rock particles
    • Water on the land
      • Transport
        • Traction
          • Large particles are carried along
        • Saltation
          • Pebble sized particles are carried along
        • Suspension
          • Small particles are carried along
        • Solution
          • Materials dissolve in water, carried along
      • Deposition
        • 1. River drops eroded material
          • 2. Happens when river slows down (velocity)
            • 3. Reasons: volume falls, eroded material increases, shallow water, reaches mouth
      • River Valley
        • Lower
          • Very wide, almost flat, deep channel
        • Middle
          • Gently sloping, wider sides, deeper channel
        • Upper
          • Steep,narrow, shallow channel
    • Abrasion
      • Rock rub against the channel, wearing it away
    • Attrition
      • Rocks smash against each other into smaller fragments
    • Solution
      • Water dissolves some types of rocks e.g. chalk

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