Harder rock Softer rock Waves attack the coastline.
Slide 3
Harder rock Softer rock Harder rock The more resistant rock is
left sticking out into the sea called a headland. The softer rock
is eroded by the sea- forming a bay. This area is now more
sheltered, this encourages deposition and beaches are formed.
Slide 4
Harder rock Softer rock Harder rock Surrounded by deep water
and exposed to the full force of the waves- the headlands are
eroded. The shallower waters in the bay continue to encourage
deposition.
This is a chalk headland. Because chalk is a sedimentary rock,
lines of weakness run throughout the headland. Hydraulic action
will exploit these weaknesses.
Slide 8
Between low and high tide, waves will attack the base of the
headland. HT LT The process of corrasion will undercut the base of
the cliff, forming a wave cut notch.
Slide 9
The undercutting by corrasion will make the cliff unstable. HT
LT This creates small caves which are enlarged over time by
erosion.
Slide 10
Caves develop on either side of the headland. HT LT These caves
erode back through the headland and meet, forming an arch.
Slide 11
Continued erosion at the base of the arch will cause the roof
to become unstable. HT LT It may collapse leaving a stack.
Slide 12
Continued erosion of the base of the stack may lead to its
collapse, resulting in a stump. HT LT
1 You need your template. This will represent a chalk
headland.
Slide 15
2 Using a blue crayon- shade the outside horizontal strips-
these represent the sea.
Slide 16
3 Using a green crayon- shade the middle horizontal strip- this
represents the top of the headland- exposed to weathering.
Slide 17
4 Just above the horizontal blue lines- shade a grey line- make
sure it reaches the top of the wave-cut notch. This represents wave
action between high and low tide.
Slide 18
5 Carefully cut out all the black areas on the template- with
the exception of the wave- cut notch. Dont cut off your stump!
Slide 19
6 It should look like this...
Slide 20
7 Using a ruler, carefully fold the horizontal lines.
Slide 21
8 Like this...
Slide 22
9 Glue along the two blue horizontal strips- on the
reverse!
Slide 23
10 Position the green strip over the centre of your book.
Gently glue down the blue horizontal strip- the one with the
stump.- Practice your positioning first.
Slide 24
11 Carefully practice folding the model... are the folds the
right way?
Slide 25
12 Finally, glue the final blue strip down. Practice the
positioning first...
