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      River processes of erosion, transportation and deposition

      Lesson details

      Learning outcome

      I can understand the processes at work in a river.

      Key learning points

      1. Rivers erode landscapes through the processes of hydraulic action, abrasion, attrition and solution.
      2. Rivers transport sediment through the processes of traction, saltation, suspension and solution.
      3. Rivers deposit sediment in areas of low energy.

      Keywords

      • Sediment - particles of rock, soil, and organic material that are carried by a river as it flows (they vary in size from fine silt to larger boulders)

      • River discharge - the volume of water that flows through a river at a given point over a specific period of time

      • River velocity - the speed at which water flows in a river

      Common misconception

      Deposition only occurs at the mouth of a river.

      Deposition happens at the mouth of a river, but it also occurs wherever the river loses energy and can no longer carry its load of sediment.

      Teacher tip

      Use of mini whiteboards to allow students to test understanding of these proceses will help to develop understanding for use in later lessons.

      Licence

      This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      What is erosion?

      The process of water slowing down
      The movement of material along the river
      Correct answer: The wearing away of riverbanks and bed by water and sediment
      The depositing of material by a river

      Q2.
      What is a meander?

      Correct answer: A bend in the river’s course
      A waterfall formed by erosion
      A fast-flowing section of a river
      A landform found in the upper course

      Q3.
      What is a floodplain?

      A steep valley created by erosion
      Correct answer: A flat area next to a river that floods
      A type of river erosion
      A deep section of a river’s channel

      Q4.
      How does a river valley change as it moves downstream?

      Correct answer: It gets wider and flatter with gentler slopes
      It stays the same from source to mouth
      It becomes steeper with more waterfalls
      It becomes deeper and narrower with no change in width

      Q5.
      What is the watershed?

      The start of a river
      A smaller river that joins the main river
      Where a river end meets the sea
      Correct answer: The boundary of the drainage basin

      Q6.
      A river's __________ describes the river's journey from source to mouth.

      cross section
      gradient
      Correct answer: long profile

      4 Questions

      Q1.
      __________ is the breakdown and removal of material by a river.

      Correct answer: Erosion
      Transportation
      Deposition

      Q2.
      When does deposition occur?

      Correct answer: At the mouth of a river
      Correct answer: Wherever the river loses energy and can no longer carry its load of sediment
      When a river is flowing very quickly

      Q3.
      What ways do rivers transport sediment?

      Correct answer: Suspension, solution, traction, saltation
      Suspension, supposition, trapping, saltinisation
      Moving, dropping, rolling, dissolving

      Q4.
      What is river discharge?

      The sediment carried by the river
      The speed of the water in the river
      Correct answer: The volume of water that flows through a river at a specific point/time

      To help you plan your 10 geography lesson on: River processes of erosion, transportation and deposition, download all teaching resources for free and adapt to suit your pupils' needs...