Diagram showing stages of Waterfall Formation

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(http://www.bbc.co.uk/bitesize/standard/geography/images/g513_b.gif)Stage 1: 

  • As the river passes over the soft rock, it is able to erode at a faster rate than harder rock, so a step in the river bed develops.
  • As years go by, a ledge of hard rock develops.

Stage 2:

  • The water rushes over the ledge and erodes the soft rock through the force of hydraulic action and abrasion. This deepens the


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