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Why are the cliffs of Dover white?
Question
#21887. Asked by Don.
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Brainy Blonde
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Around seventy million years ago, this part of Britain was submerged by a shallow sea. The sea bottom was made of a white mud formed from the fragments of coccoliths the skeletons of tiny algae that floated in the surface waters of the sea. This mud was later to become the chalk. See: http://www.dover.gov.uk/museum/resource/articles/cliffs.htm I just watched a documentary about this the other day!
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