HANK MORGAN / SCIENCE PHOTO LIBRARY HANK MORGAN / SCIENCE PHOTO LIBRARY
Puu Oo lava flow on Kilauea volcano, Hawaii. The Puu Oo eruption occurred intermittently from 1983 to 1986, producing occasional tall lava fountains lasting hours or days separated by quiet periods of about a month. From July 1986 to 1989 the lava flowed continuously at an average rate of 0.4-0.5 million cubic metres a day. Kilauea is the world's most active volcano.
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