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Mount Nyiragongo

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There are few things quite as tense as watching one volcanologist mutter, "Oh my god. He's crazy. He's crazy," while watching another volcanologist scramble around the edge of a caldera.

It only gets more tense when you realize that the volcano in question is Nyiragongo in the Democratic Republic of the Congo—which has some of the fastest-moving lava flows ever recorded. The key feature of Nyiragongo is that lake of lava in the center of the crater that you see in the video. In January 1977, the lava lake was 2000 feet deep. When the volcano erupted later that month, the lake emptied dry in less than an hour. Lava was clocked at 40 mph.

Video clip from the BBC's "Journey to the Center of the Planet"

More about the program this came from.

Via EstudandoGeologia and Chris Rowan

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In June 2010, a team of scientists and intrepid explorers stepped onto the shore of the lava lake boiling in the depths of Nyiragongo Crater, in the heart of the Great Lakes region of Africa. The team had dreamed of this: walking on the shores of the world's largest lava lake. Members of the team had been dazzled since childhood by the images of the 1960 documentary "The Devil's Blast" by Haroun Tazieff, who was the first to reveal to the public the glowing red breakers crashing at the bottom of Nyiragongo crater. Photographer Olivier Grunewald was within a meter of the lake itself, giving us a unique glimpse of it's molten matter. (The Big Picture featured Olivier Grunewald's arresting images of sulfur mining in Kawah Ijen volcano in East Java, Indonesia, in a December 2010 post.) -- Paula Nelson (28 photos total)
The view from the volcano’s rim, 11,380 feet above the ground. At 1,300 feet deep, the lava lake has created one of the wonders of the African continent.

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