River processes

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Made by GCSE students for their revision work. May contain some misconceptions! -_^

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River processes

  1. 1. River Processes
  2. 2. But What Do YOU Know?
  3. 3. What processes occur in a river?
  4. 4. <ul><li>Abrasion/Corasion </li></ul><ul><li>Attrition </li></ul><ul><li>Hydraulic Action </li></ul><ul><li>Corrosion/Solution </li></ul>
  5. 5. Example of All Types of Erosion Steep Cliff Centrifugal Force River direction! Eroding Cliff Slip off slope. Deposition Occurs
  6. 6. Abrasion/Corrasion <ul><li>Fragments of rock carried by riverbed </li></ul><ul><li>Wears away riverbed and banks </li></ul><ul><li>Can carry tons of material </li></ul><ul><li>Responsible for deepening valleys </li></ul>
  7. 7. Attrition <ul><li>Pebbles and rocks colliding </li></ul><ul><li>Reduces their size </li></ul><ul><li>Smoothens rock surface </li></ul>
  8. 8. Hydraulic Action <ul><li>Moving water forced against riverbanks </li></ul><ul><li>Causes them to collapse and wash away </li></ul>
  9. 9. Diagram of Hydraulic Action
  10. 10. Corrosion/Solution <ul><li>Chemical reaction occurs </li></ul><ul><li>Slightly acidic water dissolves calcium </li></ul><ul><li>Breaks down rocks such a limestone </li></ul>
  11. 11. Other Factors Affecting The Rates of Erosion Include: <ul><li>Gradient </li></ul><ul><li>Rock Type </li></ul><ul><li>Bedload </li></ul><ul><li>Human Factors </li></ul>
  12. 12. Plenary, What Have You Remembered?
  13. 13. What river process is where moving water is forced against riverbanks?
  14. 14. A. Hydraulic Action
  15. 15. Attrition is ........ and …….. colliding together
  16. 16. A. Pebbles and Rocks
  17. 17. What other factors effect erosion? <ul><li>A) Gradient, River speed, Bedload and Human Factors </li></ul><ul><li>B) Gradient, Rock Type, Bedload and Human Factors </li></ul><ul><li>C) Yoghurt, Rock Types, Nick’s earring and Jack’s iPhone </li></ul><ul><li>D) Location, Rock Type, Bedload and Human Factors </li></ul>
  18. 18. B) Gradient, Rock Type, Bedload and Human Factors
  19. 19. In the process solution/corrosion, is the water acid or alkaline?
  20. 20. Acid
  21. 21. Thank You For Watching! And Enjoy The Painting Jack, Nick & Greg (FEHS Geog Students 2009-11)

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