Fire & Ice

Volcanoes and frozen lands make an explosive combo

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FIRE AND ICE Iceland’s Eyjafjallajökull volcano erupted quietly at first this spring (shown), until magma shifted directly beneath a glacier. Odd Stefan Thorisson/Nordicphotos/Corbis
THIN ICE, MORE EXPLOSIONS Computer modeling of volcanic eruptions under ice suggests that thin ice plus even a little magma equals hazardous explosive eruptions.