DAVID HARDY / SCIENCE PHOTO LIBRARY DAVID HARDY / SCIENCE PHOTO LIBRARY
Illustration depicting a fissure eruption in the Krafla field, Iceland, in September 1977. A fissure eruption is the exploitation of large cracks in the surface made by upswelling magma. With a large fissure, the magma may escape along its whole length, rather than at a single point. The eruption depicted here occured along a 2 kilometer fissure, releasing large quantities of fluid lava. The region around Krafla volcano contains many geothermal power stations, which gain their heat from subterranean volcanic processes.
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