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Page last updated at 06:35 GMT, Wednesday, 25 May 2011 07:35 UK

Ash cloud 'appears to be waning'

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It is still possible that ash erupting from a volcano in Iceland could cause disruption to half term travellers.

Clive Oppenheimer, a volcanologist at Cambridge and author of Eruptions That Shook The World, examines the long term threat level.


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