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Nature 453, x (26 June 2008) | doi:10.1038/7199xb; Published online 25 June 2008

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Much of Earth's crust has been formed over time by volcanoes at mid-ocean ridges on the sea floor. Geologists thought that the occurrence of explosive volcanic eruptions — such as that seen in 1980 at Mount St Helens in Oregon — would be rare, if not non-existent, along great tracts of these ridges owing to the extreme water pressure at depths of more than 3,000 metres.