Sunday, 22 April 2007

Waterfall Formation

Waterfalls form where the river bed has a layer of harder rock overlying the softer rocks.

  1. As water falls the softer rock is eroded much more quickly than the harder rock; therefore undercutting the harder rock.
  2. The hard, overrhanging rock eventurally collapses.
  3. The collapsed rocks fall into the plunge pool causing more erosion of the soft rocks and a deeper plunge pool.
  4. This goes on continuously causing the waterfall to retreat upstream.
  5. The waterfall leaves a steap sided gorge as it reatrets.
Waterfalls may also be caused as a result of:
  • Glacial Erosion
  • A Fall in Sea Level
  • Earth Movement

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