Scientists fear tremors at the Eyjafjallajokull (ay-yah-FYAH-lah-yer-kuhl) volcano could trigger an even more dangerous eruption at the nearby Katla volcano - creating a worst-case scenario for the airline industry and travelers around the globe.
A Katla eruption would be 10 times stronger and shoot higher and larger plumes of ash into the air than its smaller neighbor, which has already brought European air travel to a standstill for five days and promises severe travel delays for days more.
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