Editing Vortex ring (section)

===Volcanoes===
[[File:Anello di fumo Etna da Zafferana.jpg|thumb|220px|right|Mount Etna vortex ring]]
{{Expand list|date=May 2012}}
Under particular conditions, some volcanic vents can produce large visible vortex rings.<ref name=ABCNews /><ref>[http://www.volcanodiscovery.com/photoglossary/smoke_ring.html Illustrated Volcano Glossary]</ref> Though a rare phenomenon, several volcanoes have been observed emitting massive vortex rings as erupting steam and gas condense, forming visible toroidal clouds:
*[[Mount Etna]],<ref>[http://news.bbc.co.uk/2/hi/science/nature/696953.stm Etna hoops it up] BBC News, 2003-03-31.</ref><ref>[http://www.swisseduc.ch/stromboli/etna/etna00/index-en.html Etna 2000] Stromboli Online, 2009-03-12.</ref><ref>[http://video.it.msn.com/watch/video/miracolo-etna-dal-cratere-anelli-di-fumo-perfetti/168go5fdp] {{Webarchive|url=https://web.archive.org/web/20120121235645/http://video.it.msn.com/watch/video/miracolo-etna-dal-cratere-anelli-di-fumo-perfetti/168go5fdp |date=2012-01-21 }} Smoke rings of Mount Etna video</ref> Italy ([[Sicily]])
*[[Stromboli]],<ref>{{cite web|url=https://www.volcanodiscovery.com/fr/photos/stromboli/0606/smokerings.html|title=Smoke rings from Stromboli volcano (June 2006)|website=www.volcanodiscovery.com}}</ref> Italy ([[Aeolian Islands]])
*[[Eyjafjallajökull]],<ref>[http://news.discovery.com/earth/iceland-volcano-smoke-ring.html Iceland Volcano Blows Spectacular Smoke Ring: Big Pics] Discovery News, 2010-05-10.</ref> [[Iceland]]
*[[Hekla]],<ref>{{cite web|url=https://www.telegraph.co.uk/earth/earthpicturegalleries/7498695/Iceland-volcano-eruption-volcanic-activity-in-the-land-of-fire-and-ice.html?image=11 |archive-url=https://web.archive.org/web/20100326135118/http://www.telegraph.co.uk/earth/earthpicturegalleries/7498695/Iceland-volcano-eruption-volcanic-activity-in-the-land-of-fire-and-ice.html?image=11 |url-status=dead |archive-date=March 26, 2010 |title=Environment |publisher=The Telegraph |date= |accessdate=2021-01-28}}</ref> [[Iceland]]
*[[Tungurahua]],<ref>{{cite web|url=http://www.earth-of-fire.com/article-les-volcans-fument-la-pipe-formation-de-vortex-toroidal-69760899.html|title=&quot; Les volcans fument la pipe&quot; - formation de vortex toroidal.|first=Bernard|last=Duyck|website=Earth of fire|access-date=2024-04-08|archive-date=2013-07-25|archive-url=https://web.archive.org/web/20130725215706/http://earth-of-fire.over-blog.com/article-les-volcans-fument-la-pipe-formation-de-vortex-toroidal-69760899.html|url-status=dead}}</ref> [[Ecuador]]
*[[Pacaya]],<ref>{{cite web|url=https://skagwaydelta.wordpress.com/2011/05/15/pacaya-volcano-blows-a-smoke-ring-in-farewell-guatemala-2005/|title=Pacaya Volcano blows a smoke-ring in farewell Guatemala 2005|date=May 15, 2011}}</ref> [[Guatemala]]
*[[Mount Redoubt]],<ref>{{cite web|url=https://www.flickr.com/photos/31220278@N05/3880927815/|title=Mt Redoubt Blowing Smoke Rings|date=August 30, 2009|via=Flickr}}</ref> United States ([[Alaska]])
*[[Mount Aso]],<ref>{{cite web|url=https://www.flickr.com/photos/mikelyvers/6890803977/|title=aso volcano smoke ring|date=February 17, 2012|via=Flickr}}</ref> Japan ([[Kyushu]])
*[[Whakaari / White Island|Whakaari (White Island)]],<ref>{{cite web|url=https://www.flickr.com/photos/mr_step/8510876313/|title=DSC_0350.jpg|date=February 21, 2013|via=Flickr}}</ref> New Zealand
*[[Gunung Slamet]],<ref>{{cite web |url=http://touch.metrotvnews.com/read/2014/09/11/290353#.VBJpsmYxW2c/ |title=''Cincin Raksasa'' Muncul di Atas Gunung Slamet - Daerah |website=touch.metrotvnews.com |access-date=17 January 2022 |archive-url=https://web.archive.org/web/20140912083101/http://touch.metrotvnews.com/read/2014/09/11/290353#.VBJpsmYxW2c/ |archive-date=12 September 2014 |url-status=dead}}</ref> [[Indonesia]] ([[Central Java]])
*[[Momotombo]],<ref>{{cite web|url=https://www.youtube.com/watch?v=sNIKDrUO29Y  |archive-url=https://ghostarchive.org/varchive/youtube/20211222/sNIKDrUO29Y |archive-date=2021-12-22 |url-status=live|title=Momotombo - Anillos de humo |publisher=YouTube |date=2015-12-05 |accessdate=2021-01-28}}{{cbignore}}</ref> [[Nicaragua]] ([[León, Nicaragua|León]])