STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Lava flow. Night view of a lava flow from Kilauea volcano, Big Island, Hawaii, USA. Lava is molten rock which has reached the surface from beneath the earth's crust by travelling along faults in the rock. The blurring effect gives the impression of speed. Lava flows can travel many kilometres per hour but most move slowly and travel only a few tens of metres per hour or even per day.
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