STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Volcanic rift zone. Iceland is the largest volcanic island on Earth and is sliced down the middle by the hot, geologically active Mid-Atlantic Ridge. This unique placement marks the boundary of the American Tectonic Plate and the Eurasian Tectonic Plate. As these plates spread, lava reaches Earth's surface, and Iceland's volcanoes are born.
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