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Slide 2

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The cliff face was initially rather straight and a geological map reveals the thin
strip of chalk that runs through the land, surrounded by clay on either side.…read more

Slide 3

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Erosion occurs when waves which are carrying material crash into the cliff and gradually wear it away in a
process called abrasion. The clay is much softer than the chalk therefore the clay erodes much quicker on either
side, leaving the chalk strip sticking out of the coast to create a headland.…read more

Slide 4

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Waves approaching the cliff trap air into the small crevices in the base of the headlands and as the waves retreat
the air is let out very rapidly, causing a mini explosion which expands the crack. This process is called hydraulic
action.…read more

Slide 5

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Water forces itself into the gaps and eventually the cracks expand further to create a sea cave in the base of the
headland. An arch is formed when erosion from the waves eventually break through to the other side of the
headland.…read more

Slide 6

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The arch expands and cracks begin to form in the roof. The roof eventually collapses, leaving a stack remaining.…read more

Slide 7

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