Erosion

• What is erosion?

  Breaking down of rock into smaller pieces
• What are the 4 processes of erosion?

  Attrition, abrasion, hydraulic action, and solution.
• What is hydraulic action?

  Erosion of rock or sediment by the force of moving water
• What is abrasion?

  Rocks rub against the bed and banks of the river (erosion)
• What is attrition?

  Rocks hit each other and break up on the river bed (erosion)
• What erosion is happening at A?

  Attrition

  
• What erosion is happening at B?

  Abrasion

  
• What erosion is happening at C?


  Solution

  
• What erosion is happening at D?

  Hydraulic action

  
• What erosion direction is this?

  Lateral erosion

  
• What erosion direction is this?

  Vertical erosion

  
• What is solution in erosion?


  When the water dissolves certain types of rock e.g. limestone
• Which courses of the river do majority of erosion occur?


  Upper and middle course