BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Mount Etna volcano. Aerial view of the four main active craters of Mount Etna in Sicily. The craters are all steaming due to the high temperature of the rocks heating water. Etna is a very active volcano which has erupted and released lava several times in recent history. Eruptions are caused by magma (molten rock beneath the surface) being forced up a vent by pressure from deep within the Earth.
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