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Blowholes are vertical faults which have been widened by wave attack. Bays form in areas where soft rock is eroded quickly, leaving headlands made from harder rock that better resists the action of the sea. But sub-aerial processes, such as rainfall, can also affect the shape of coastal landforms; for example, cliff slumps are caused when layers of boulder clay, left behind by melting glaciers, become saturated and collapse.
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First broadcast:
21 February 2008

Classroom Ideas

This clip can be used to explain that it is not only the sea that erodes the coast, but rainfall as well. Students could examine the process of cliff slumping with the use of annotated diagrams.

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