Waterfalls and gorges

• How is a gorge formed?


  When the soft rock erodes and the overhang of hard rock collapses, the river retreats upstream creating a steep sided gorge.
• How is the soft rock eroded?

  Through erosion processes such as hydraulic action which is the sheer force of the water eroding beds and banks
• What is created when the soft rock erodes?


  A water fall.
• What is another name for the soft and hard rock?

  Alternating rocks of different geology.
• Why does the hard rock form an overhang?


  Because it takes longer to erode than the soft rock as it is harder.
• When the overhang collapses what does it fall into?

  A plunge pool.
• What is a plunge pool?


  What the waterfall falls over the overhang into.
• What happens between the river load due to the fast moving currents?


  Abrasion where the river load scrapes against the bed and banks
• What is the soft rock called on High force waterfall on the river tees?

  Shale, sandstone and limestone
• What is the hard rock called on the High Force waterfall along the river tees?

  Whinstone
• Where is the river tees?


  In County Durham
• What is the waterfall called along the river tees?


  High force waterfall
• How large is the gorge on High Force waterfall?

  500m