L2 ap weathering and mass movementn

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L2 ap weathering and mass movementn

  1. 1. Aim: To understand how weathering and mass movement processes occur along the coast
  2. 2. Quick Recap • Can you remember from last lesson what the following words mean? • Fetch • Beach • Crest • Swash • Backwash • Constructive • Destructive A clue!
  3. 3. ………………………………………. wave
  4. 4. ………………………………………. wave
  5. 5. A) Processes of Weathering • These are _____________ that break down rocks in one place which involves no ____________ . It differs to erosion, as erosion needs movement to ______ . A. Processes, water, explode B. Processes, movement, work C. Animals, movement, ignite. D. People, machines, erupt
  6. 6. 1) Physical / Freeze Thaw • Freeze thaw weathering
  7. 7. • This is the most common. • It involves the alternative actions of freezing and melting. • It only occurs in places where there the temperature fluctuates around 0 degrees.
  8. 8. 2) Chemical Weathering • This is also known as solution. Like sugar dissolves in tea, some rocks (e.g. Limestone) and minerals dissolve in rainwater.
  9. 9. 2) Chemical Weathering • The traces of acid in rainwater (water + carbon dioxide = weak carbonic acid) form a chemical reaction between the acid and limestone. • This can form ‘limestone pavements’.
  10. 10. 2) Chemical weathering • Florida Sink hole info here and video here
  11. 11. 3) Biological Weathering • Plant and animals may weaken rock structure. E.g. sand martins along the Norfolk coastline.
  12. 12. B. Processes of Mass Movement • Rock fall - here • Landslide • Mudflow • Slump – rotational slip • Using the worksheet, complete the four diagrams to show these processes using your text book p147
  13. 13. Sketch and annotate this image to show mass movement
  14. 14. Homework
  15. 15. x

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