File:Entrance to the Lava tunnel on the Island of Santa Cruz Galapagos photo by Alvaro Sevilla Design.JPG

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English: Professional photographer David Adam Kess to this photo at the entrance to a 2,500 meter long lava tunnel on the Island of Santa Cruz Galapagos.


Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow, expelled by a volcano during an eruption. They can be actively draining lava from a source, or can be extinct, meaning the lava flow has ceased and the rock has cooled and left a long, cave-like channel.

Lava tubes are likely to exist on previously or currently geologically active planets or moons, including the Earth.

http://en.wikipedia.org/wiki/Lava_tube
Date
Source Own work
Author David Adam Kess

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3 December 2011

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current00:07, 27 December 2011Thumbnail for version as of 00:07, 27 December 20114,000 × 3,000 (3.12 MB)Alvarosevilladesign

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