BBC Learning Zone Clips

CLIP 3239

Waterfalls and gorges - erosion and deposition

Waterfalls and gorges - erosion and deposition
Key Info
  • Waterfalls and gorges - erosion and deposition
  • Duration: 05:19
  • The source of the River Conwy is high in the Snowdonian mountains. The river has eroded away the landscape by hydraulic action, abrasion and attrition. Waterfalls are formed where hard rock lies over a softer rock. Gorges are found where waterfalls retreat upstream. Meanders and floodplains are found in the lower course of the river. Estuaries are found at the mouth of the river. The river transports material when it has enough energy. When the river loses energy, it deposits the material it has been carrying. Ordnance Survey mapping © Crown Copyright.
  • Subject:




  • Keywords: geologic time, rocks, upper, plunge pool, debris, undercutting, suspension, rapids, point bar, velocity, depth, helicoidal flow
Ideas for use in class
  • This clip features the River Conwy. It could be used as part of a case study of this river. The clip also clearly explains some key terminology associated with rivers and there are some nice animations. The teacher could show the clip and then provide a taboo or sorting activity to test whether students understood the key terms.
Background details
  • Clip language : English
  • Aspect ratio : 4x3

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