Porous volcanic rock. Pumice is an example of a volcanic rock where gas bubbles form cavities inside the rock as the molten lava cools. In many cases,

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Porous volcanic rock. Pumice is an example of a volcanic rock where gas bubbles form cavities inside the rock as the molten lava cools. In many cases, this means that the rock can float on water. This sample is from Iceland.

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Size: 5156px × 3425px
Photo credit: © DANIEL SAMBRAUS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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