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{{Short description|Floating mass of pumice
[[File:The eruption of Fukutoku-Oka-no-Ba 05.jpg|thumb|right|Pumice rafts from the eruption of [[Fukutoku-Okanoba]] submarine volcano in 1986, seen from a ship]]▼
[[File:Pumice raft.jpg|thumb|upright=1.3|Pumice raft near [[Tonga Islands]] in August 2006, taken by [[NASA Earth Observatory]], based on data from the [[Moderate-Resolution Imaging Spectroradiometer]] Rapid Response System, [[Goddard Space Flight Center]]]]▼
[[File:Pumice stone444.jpg|thumb|
A '''pumice raft''' is a floating raft of [[pumice]] created by some eruptions of [[submarine volcano]]es or coastal subaerial volcanoes.
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==Notable examples==
▲[[File:The eruption of Fukutoku-Oka-no-Ba 05.jpg|thumb|right|Pumice rafts from the eruption of [[Fukutoku-Okanoba]] submarine volcano in 1986, seen from a ship]]
[[Sandy Island, New Caledonia|Sandy Island]], a [[phantom island|non-existent island]] near New Caledonia, was reported in 1876 by the whaling ship ''Velocity'' and subsequently included on some maps well into the 20th century. According to a team of University of Sydney scientists, it is possible that this false report may have been occasioned by pumice rafts being mistaken by the ''Velocity'' for dry land.<ref>{{cite journal |last1=Seton |first1=M. |last2=Williams |first2=S. |last3=Zahirovic |first3=S. |last4=Micklethwaite |first4=S. |date=9 April 2013 |title=Obituary: Sandy Island (1876 –2012) |journal=Eos, Transactions American Geophysical Union |volume=94 |issue=15 |pages=141–142 |bibcode=2013EOSTr..94..141S |doi=10.1002/2013EO150001 |doi-access=free}}</ref><ref>{{cite news |author=Joel Achenbach |date=April 4, 2013 |title=Scientist unravels mystery of Coral Sea's ghostly Sandy Island |newspaper=Washington Post |url=https://www.washingtonpost.com/national/health-science/scientist-unravels-mystery-of-coral-seas-ghostly-sandy-island/2013/04/14/76316606-a508-11e2-8302-3c7e0ea97057_story.html |url-access=subscription |accessdate=May 24, 2021}}</ref>
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Pumice rafts drifted to [[Fiji]] in 1979 and 1984 from eruptions around Tonga, and some were reportedly {{convert|30|km|mile}} wide.
▲[[File:Pumice raft.jpg|thumb|upright=1.3|Pumice raft near [[Tonga Islands]] in August 2006, taken by [[NASA Earth Observatory]], based on data from the [[Moderate-Resolution Imaging Spectroradiometer]] Rapid Response System, [[Goddard Space Flight Center]]]]
Volcanic activity in the South Pacific near Tonga on August 12, 2006 caused the emergence of a new island. The crew of the ''Maiken'', a yacht that had left the northern Tongan islands group of [[Vava'u]] in August, reported that they had seen streaks of light, porous [[pumice]] stone floating in the water—and then had "sailed into a vast, many-miles-wide belt of densely packed pumice".<ref>{{cite web |url=http://yacht-maiken.blogspot.com/2006/08/stone-sea-and-volcano.html |title=Stone sea and volcano |work=Fredrik and Crew on Maiken |publisher=[[Blogger (service)|Blogger]] |date=2006-08-17 |accessdate=2008-11-07}}</ref> They went on to witness the [[ephemeral]] island known as [[Home Reef]] breaching the surface.<ref>[http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=17610 New Island and Pumice Raft, Tonga], NASA Earth Observatory photo with commentary, November 2006</ref>
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