Transcript Lesson 3- Weathering Processes

STARTER- NAME THAT FEATURE!
LESSON 4- WEATHERING
PROCESSES
Lesson Objective:
To understand the physical processes
which act on coastal geology to create
distinctive coastal landforms
WEATHERING- IS THE BREAKDOWN
OF ROCKS IN SITU. THIS MEANS IT
HAPPENS WHERE THE ROCK IS.
ROCKS ARE WEAKENED BY BEING
CHEMICALLY ATTACKED AND
MECHANICALLY BROKEN DOWN.
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Use page 74 Evolving Planet to find out what
these types of weathering are:
Mechanical Weathering
 Chemical Weathering
 Biological Weathering
 Sub-aerial processes
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MASS MOVEMENT-IS THE MOVEMENT OF
MATERIALS DOWNSLOPE, SUCH AS ROCK
FALLS, LANDSLIDES OR CLIFF COLLAPSE.
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The coast can also change shape by processes of
mass movement; this includes:
Rock falls
 Slumping of cliffs
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Why do cliffs collapse?
There are several reasons why cliffs collapse:
1. Marine processes cliff bases eroded by
hydraulic action and abrasion= steeper cliff
2. Weathering weakens rocks
3. Heavy rain saturates permeable rock at the
top. May also erode cliff faces as it goes
down
4. Water flows through permeable rock adding
to the weight of the cliff
5. Human actions buildings add to the weight
which can push down onto a weak cliff.
WHICH OTHER FACTORS AFFECT
COASTLINES?
You have seen all the physical ways in which coasts are
affected. How else could the coast be affected? Discuss
with your partner and then share ideas with the
class.
1.
2.
3.
Changing sea levels and storm activity
Storms at sea
Climate change flood risk
Read page 75 of Evolving Planet and 80 of GCSE
Geography. Under the 3 headings above add at least
5 bullet points to explain how they can also affect
the coastline. Add examples of areas that will be
affected.
PLENARY- DISCUSS WITH A PARTNER
RAG your understanding of the unit so far.
 In your book RAG your understanding and
ability to answer the following questions:
Would you be able to explain a process of
transportation?
 Would you be able to explain the role of erosion in
changing coastal landscapes?
 Would you be able to describe different types of
waves and how they are formed?
 Would you be able to link the impacts of climate
change?

EXAM-STYLE QUESTION

Using examples, explain how sea level rise could
threaten people and their property. (6 marks)
HOMEWORK
Use the Met Office website
http://www.metoffice.gov.uk
To research the 1953 flood under the headings
Causes and Impacts.
Explain why the Thames Barrier was built.
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