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Page last updated at 07:42 GMT, Saturday, 17 April 2010 08:42 UK

Volcano has 'unusually fine ash'

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The National Air Traffic Service has reimposed the ban on flights to cover the whole of the UK and extended it until at least seven o'clock this evening. Dr. Thorvaldur Thordarson, a reader in vulcanology, discusses whether it is possible to tell how long the current volcanic activity in Iceland will go on.

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