BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Lava flow. View of a large lava flow on Mount Etna at night. This photograph was taken after the eruption in 1992. This was a major eruption, and the lava flows were extensive. Lava is molten rock forced out of cracks in the earth by pressure from magma (subterranean lava) beneath it. Etna is a very active volcano, and has erupted several times in recent history. It lies on the island of Sicily, Italy.
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