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Old Harry Rocks - coastal processes and landforms

The cliffs around Old Harry Rocks are made of chalk. Wave refraction causes erosion of the headland and deposition in the bays either side. The cliffs are eroded when waves undercut the land causing the rock above to collapse. Caves are formed where cracks in the chalk are expanded due to hydraulic action. Caves can open up through the cliff to form arches, and the collapse of arches results in stacks such as Old Harry Rocks.

4 minutes

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Geography in Animation

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