Beachy Head and the Seven Sisters are famous for their bright white chalk cliffs. The chalk was formed during the Late Cretaceous period (up to 100 million years ago), a time when the area was submerged by the sea.
The chalk was gradually pushed up, and rising sea levels cut into the chalk, forming the English Channel and creating a stunning range of undulating cliffs.
The cliffs continue to be eroded by the waves below. While large movements of the cliff are rare, slabs of chalk frequently fracture and fall away. As the lower cliff material is worn by the waves, the cliffs above are undermined until they eventually collapse.[40 pictures]
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