L2 ap weathering and mass movementn
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L2 ap weathering and mass movementn

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L2 ap weathering and mass movementn L2 ap weathering and mass movementn Presentation Transcript

  • Aim: To understand how weathering and mass movement processes occur along the coast
  • Quick Recap • Can you remember from last lesson what the following words mean? • Fetch • Beach • Crest • Swash • Backwash • Constructive • Destructive A clue!
  • ………………………………………. wave
  • ………………………………………. wave
  • 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
  • 1) Physical / Freeze Thaw • Freeze thaw weathering
  • • 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.
  • 2) Chemical Weathering • This is also known as solution. Like sugar dissolves in tea, some rocks (e.g. Limestone) and minerals dissolve in rainwater.
  • 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’.
  • 2) Chemical weathering • Florida Sink hole info here and video here
  • 3) Biological Weathering • Plant and animals may weaken rock structure. E.g. sand martins along the Norfolk coastline.
  • 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
  • Sketch and annotate this image to show mass movement
  • Homework
  • x