Wikipedia:POTD column/May 23, 2006

From Wikipedia, the free encyclopedia

Thurston Lava Tube, Hawai'i Volcanoes National Park, USA

Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow. 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. Tubes form in one of two ways: by the crusting over of lava channels and from Pahoehoe flows where the lava is moving under the surface.

Photo credit: Michael Oswald
Archive - More featured pictures...

Retrieved from "http://en.wikipedia.org../../../p/o/t/Wikipedia%7EPOTD_column_May_23%2C_2006_82b3.html"