Geography

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rivers
- how rivers shape the land
  - 4 main processes
    - Attrition
      - Material is moved along the bed of a river , collides with other material, and breaks up into smaller pieces.
    - Corrasion
      - fine material rubs against the river bank . The bank is worn away, by a sand - papering action called abrasion, and collapses.
    - corrosion
      - some rocks forming the banks and bed of a river a river are dissolved by acids in the water.
    - Hydraulic action
      - the sheer force of water hitting the banks of the river.
Material is moved along the bed of a river , collides with other material, and breaks up into smaller pieces.