Pumice rafts from the eruption of Fukutoku-Okanoba submarine volcano in 1986, seen from a ship A piece of pumice A pumice raft is a floating raft of pumice created by some eruptions of submarine volcanoes or coastal subaerial volcanoes. Pumice rafts have unique characteristics, such as the highest surface-area-to-volume ratio known for any rock type, long term flotation and beaching in the tidal z

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