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08/11/2011
What makes the ripples on a sandy beach? And why is the sea salty? Adam Walton visits Bangor's School of Ocean Sciences to investigate sea wash, sediment and sticky mud.
Last on
Sun 13 Nov 201106:30
BBC Radio Wales

What makes the ripples on a sandy beach? And why is the sea salty? Adam Walton visits Bangor's School of Ocean Sciences to investigate sea wash, sediment and sticky mud.