l2 ap weathering and mass movementn
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, explodeB. Processes, movement, work C. Animals, movement, ignite. D. People, machines, erupt
• 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
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