GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Lava tube formation. Image 1 of 2. Cutaway artwork of the formation of a lava tube. A river of lava (yellow) issuing from a volcano (not seen) begins to cool and solidify. Beneath the surface, the lava remains hot and molten, and continues to move downhill away from the volcano. For the next stage in lava tube formation, see image E390/378.
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