For more than 100,000 years, a Greek volcano lay silent. But deep underground, it was still growing. Tiny zircon crystals show magma was quietly brewing between eruptions, researchers report April 22 in Science Advances. The finding suggests that some volcanoes scientists think are dead may not be dead at all, and it could help identify quiet volcanoes that might still erupt in the future.
“I think that we definitely have to start reevaluating how we classify extinct volcanoes,” says Razvan-Gabriel Popa, a volcanologist at ETH Zurich in Switzerland.
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