G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Pahoehoe lava from Kilauea volcano, in the Hawaii Volcanoes National Park, Hawaii, USA. This thick lava with a ropey texture can flow at speeds of up to 50 kilometres per hour. Pahoehoe is a basaltic lava with a low melting point. The crust insulates the lava keeping it molten allowing it to travel great distances from its origin.
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