Pumice raft
Floating mass of pumice in the ocean / From Wikipedia, the free encyclopedia
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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 zone, exposure to a variety of conditions, including dehydration, and an ability to absorb many potentially advantageous elements/compounds. For at least these reasons, astrobiologists have proposed pumice rafts as a possible ideal substrate for the origin of life.[1]
Biologists have suggested that animals and plants have migrated from island to island on pumice rafts.[2][3]