l.o. to explain coastal erosion geography · 2020. 5. 8. · these lovely sandy bays are formed as...
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L.O. To explain coastal erosion Geography
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What is the coast?
The coast is where the land meets the sea.
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What physical features can you see on the coast?
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What physical features can you see on the coast?
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Whys does the coast look different everywhere?
The sea constantly bashes against the edge of the land in different directions.
Some rock in the land is soft, some is hard.
Some places have more strong and forceful storms than others.
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What is change?
Change is when something becomes different to how it was before.
E.g. it may be bigger or smaller in size etc.
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Coastal Changes
Today we are learning about how the coast
changes over time.
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How are bays and headlands formed?
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http://www.viewpure.com/F1PtFRs23EA?start=0&end=0
Click on the link to find out more!
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INSIDE THE COAST
The coasts are made of soft or hard rock. Often it can be in big patches likes this:
Soft rock Soft rockhard rock hard rockhard rock
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INSIDE THE COAST
Over time the sea can erode away the soft rock parts of the coast.
Soft rock Soft rockhard rock hard rock
hard rock
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INSIDE THE COAST
In the gaps sand and rocks can collect and form sandy or pebbly bays.
Soft rock Soft rockhard rock hard rock
hard rock
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These lovely sandy bays are formed as the weaker section of coastline here
have been eroded. The headlands stick out as they are harder more
resistant rock which aren’t as easily eroded.
Harder, more resistant rock
Softer, less resistant rock has already been
eroded. Sediment has formed beaches.
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Now have a go at question 1 on sheet
How are bays and headlands formed?
Original Coastline Before Erosion
Present Day Coastline
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http://www.viewpure.com/00Khn0RSpYA?start=0&end=0
Click on the link to find out more!
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1.Waves attack a rock face using the force of the water and a crack
forms in the weakest part of the rock.
2.Over time the crack enlarges to form a cave.
3.The cave is widened and deepened and pushes through the
headland to form a natural arch.
4.More erosion from the sea and weathering can cause the arch to
collapse, leaving a stack.
5.Over time further weathering and erosion lead the stack to wear
down to a stump.
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stack fault
stump collapsed arch
cave blowhole
arch
Now have a go at question 2 on the sheet
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1. Fault 5. Collapsed arch
2. Blowhole 6. Stack
3. Cave 7. Stump
4. Arch
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1. Original position of the cliff
2. Cliff retreats
3. Present position of the cliff
4. Sea level (high tide.)
5. Wave cut notch at foot of cliffs
6. Wave cut platform.
CHALLENGE (Question 3)
http://www.viewpure.com/TGxsC74H2Jw?start=0&end=0
Watch this clip
Then have a go at the challenge question (3)
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Order these images to
show how an arch and
stack is formed.
EXTRA EXTENSION
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Plenary
When have you seen examples of this in real life?
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