A lava tube, or pyroduct,[1] is a natural conduit formed by flowing lava from a volcanic vent that moves beneath the hardened surface of a lava flow. If lava in the tube empties, it will leave a cave.
Kazumura Cave, Hawaii – Not only the world's most extensive lava tube, but at 65.5 kilometres (40.7mi), it has the greatest linear extent of any cave known.[12]
↑ Guest, J.E; Duncan, A.M.; Stofan, E.R; Anderson, S.W. (2012). "Effect of slope on development of pahoehoe flow fields: Evidence from Mount Etna". Journal of Volcanology and Geothermal Research. 219–220: 52–62. doi:10.1016/j.jvolgeores.2012.01.006.
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