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Predicting the movement of volcanic ash

European meteorologists have turned to improved technology to help determine where ash particles are and where they are headed. It’s a sophisticated system using electromagnetic waves that are reflected by particles in the air. (Michele Andina, swissinfo.ch/SRF)

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SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR