Lava tube
Natural conduit through which lava flows beneath the solid surface / From Wikipedia, the free encyclopedia
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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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/62/Thurston_Lava_Tube%2C_Big_Island.jpg/640px-Thurston_Lava_Tube%2C_Big_Island.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Manjanggul_Lava_Tower.jpg/320px-Manjanggul_Lava_Tower.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Lavacicles_8238.jpg/640px-Lavacicles_8238.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Close-up_of_a_skylight_on_coastal_plain%2C_with_lava_stalactites_forming_on_the_roof_of_the_tube.jpg/640px-Close-up_of_a_skylight_on_coastal_plain%2C_with_lava_stalactites_forming_on_the_roof_of_the_tube.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/Lava_tube_Big_island_Hawaii_%2844459923190%29.jpg/640px-Lava_tube_Big_island_Hawaii_%2844459923190%29.jpg)