![](http://www.alamy.com/thumbs/6/8C20C409-98D2-457E-AEE0-E8069440E4FE/BB0WFH.jpg)
Cooled lava with iron oxide deposit inside lava tube. Big Island Hawaii
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.
Size: 5616px × 3744px
Location: Kula Kai Lava tube Oceanview Hawaii
Photo credit: © Craig Ellenwood / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: big, cavern, channel, conduit, cooled, deposit, drip, eruption, geology, hawaii, iron, island, lava, mineral, molten, oxide