STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Lava flow from the Kilauea volcano on Big Island, part of the Pacific island chain of Hawaii, USA. Lava is molten rock that is produced by volcanoes as an upwelling of the magma found beneath the Earth's crust. Lava flows vary in their speeds, slowing as they cool and solidify to form black volcanic rock. Kilauea is one of the most active volcanoes in the world.
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