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Presumeable you mean the Eyjafjallajökull volcano. When this volcano erupted in 2010 it produced a massive cloud of ash that spread across the skies over much of Europe. Volcanic ash, even in relatively low concentrations, poses a significan threat to planes in flight, especially jet aircraft. Ash sucked into a jet engine melts and resolidifies inside the engine as solid glass, which can cause engine failure. Ash can also scratch the windshield, reducing the pilot's ability to see.

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11y ago

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