gorge

• gorges are examples of erosion
• gorge

  a narrow, steep sided valley with bare, rocky walls (when associated with waterfalls it can be called a gorge of recession)
• where are gorges found?

  in the upper course, immediately downstream of a waterfall, eg a small one after the break its neck waterfall on a tributary of the river severn
• characteristics of a gorge:

  • very narrow valley
  • very steep, high valley sides
  • river channel takes up most, if not all of the valley floor
  • turbulent, fast flowing white water
  • bare rock on valley sides
  • boulders on the river bed
• stage 1

  as a waterfall continues to erode, it moved backwards / upstream towards the source. this leaves behind a narrow, steep sided gorge that gets longer over time