BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Aerial photograph of a lava tube at Kilauea volcano, Hawaii. A hole in the roof of a lava tunnel, an underground outflow pipe of the volcano, is called a skylight by volcanologists. The skylight reveals the highly fluid, glowing lava flowing downhill under the crust of solidified lava layers.
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