G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Lava flow. Rising steam illuminated by lava flowing into the ocean at the Hawaiian coast. This lava flow originated from the Kilauea volcano, which is one of the world's most active. Lava reaches volcanoes from the Earth's interior through faults in the crust, and is forced through them by the high pressure within the Earth. The black rock of the Hawaiian islands is made entirely from old lava flows. The continuous emissions from volcanoes such as Kilauea mean that the Hawaiian islands are still increasing in size.
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