04 Rock Type

1.
review exam questions

2. Think read slides about Swanage Coast
3.Watch video headland and bays
4. Task make notes on headland and bays and detail Dorset page 98 and
102
Example questions reviewing last lesson Answer one of the leveled questions below based
on last lesson.
Starter
Figure 1
Easy (C grade)
What type of wave would the wind in
B create and what type of wave
would be created by winds A and C?
(2 marks)
Medium (B grade)
Explain the answer to the C grade
question. (4 marks)
Hard (A*-A grade)

Explain how the large waves could
be created in figure 1. (3 marks)
Example questions reviewing last lesson
Study Figure 1, which shows how the coastline of an area has changed
over time.
Name and describe
two processes of
erosion that could
have caused the
coastal change
shown in Figure 1.
(4)
Process 1: ……………………………………………………………………............
………………………………………………………………………………………………..
Process 2: ……………………………………………………………………............
………………………………………………………………………………………………..
Study Figure 1, which shows how the coastline of an area has changed
over time.
Name and describe
two processes of
erosion that could
have caused the
coastal change
shown in Figure 1.
(4)
MODEL ANSWERS:
Hydraulic power (1) is when the waves smash into the cliff. Trapped
air is forced into holes and cracks in the rock eventually causing the
rock to break apart (1). Abrasion (1) is when waves hurl sand and
shingle at cliffs. The sediment scratches and scrapes against the rock
surface causing it to become smooth (1). Attrition (1) is when rock
fragments carried by the sea knock against one another causing them
to become smaller and more rounded (1).
How rock type shapes the coast
Look at the image of this
coastline in Dorset, United
Kingdom.
Pair talk: Why is it not

straight?
Where is the most erosion
occurring?
What might happen
overtime?
Hard rocks such as granite,
limestone and chalk are
tougher and more resistant
to erosion than soft rocks
such as clays and sands.
The harder rocks form
impressive cliffs and
headlands that point out to
sea, whilst soft rocks form
bays or low-lying stretches of
the coastline.
https://www.youtube.com/watch?v=F1PtFRs23EA headlands and bays

Being cracked or
folded can also
weaken the rock
Headlands and Bays at Dorset Coast
Different types of rock at the coastline will be eroded at
different rates. Softer bands of rock erode more easily to
form bays. As the bays are sheltered, deposition takes place
and a sandy beach forms.
The harder bands of rock are eroded much more slowly. They
jut out into the sea to form headlands. Erosion dominates in
these high-energy environments, which explains why there
are no beaches. Most erosional landforms are found at
headlands.
DURLSTON HEAD SWANAGE BAY
Limestone Crescent shaped
Steep sides Soft rock such as sand and
High energy area clay forming a crescent
affected by destructive shape.
waves. Low energy constructive
Hard rock jutting out to waves.
sea. Two headlands mark the
edges of the bay.
How are Headlands and Bays formed?
Differential erosion means soft rocks are eroded at a

faster rate than hard rocks, this forms bays sheltered
by headlands.
Your tasks Title : How rock type shapes the coast
Use the info on these power points and the video clip
1.Draw/copy and paste a diagram to show Dorset’s Coast before and during
erosion and Dorset’s Coast today.
2. Explain the formation of headlands and bays.
3.Label Durlston Head and Swanage Bay.
4.Describe the characteristics of Durlston Head and Swanage Bay.
DURLSTON HEAD SWANAGE BAY

Sands and Clays Crescent shaped
Limestone
Steep sides Wealdon Clay
Chalk
High energy area Soft rock such as sand and
affected by destructive clay forming a crescent
Wealdon Clay shape.
waves.
Limestone Hard rock jutting out to Low energy constructive
sea. waves.
Dorset’s Coast today.
Two headlands mark the
(Discordant Coastline)
edges of the bay.
Processes
This covers a range of actions
which help break down, transport
and shape the coast.
Use the word doc and page 96 to
edit the words or record the
correct key word with its
definition. There is a glossary in
the back of your text book.
https://www.youtube.co
What processes could be creating these
m/watch?v=U9EhVa4M
mEs
coastlines?
Watch the clip
Create your own
diagram to explain how
Longshore drift moves
sediment along the coast
Then have a go at the
trial?
Timed task
• With the aid of a diagram explain the process of Longshore drift (5
marks)
• Set your timer and off you go….. No more than 5 mins.
Timed task mark your work ….
• With the aid of a diagram explain the process of Longshore drift (5
marks)
• Mark scheme look for:
• Beach and sea labelled
• Prevailing wind direction
• Swash and backwash with gravity
• Diagram with correct zig zags and sediment
• Overall direction of LSD drawn in
Practise your map skills
• Page 105 text book
• Complete the activities page 104
• Answers on the audio

Then if understood all this complete the
processes quiz on show my homework!
• You should have :
• Reviewed exam questions at the beginning
• Notes on headlands and bays ref Dorset coast example
• Processes Key words linked up
• Map work
• LSD notes and trial mini answer and self mark
• Then the QUIZ!

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1.

review exam questions

Hard (A*-A grade)

Pair talk: Why is it not

https://www.youtube.com/watch?v=F1PtFRs23EA headlands and bays

Differential erosion means soft rocks are eroded at a

DURLSTON HEAD SWANAGE BAY

• Answers on the audio

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