DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Plate boundary. This fissure marks the boundary between the North American and the European tectonic plates. The two plates are moving apart, creating cracks in rock at the Earth's surface. The boundary, known as the mid-Atlantic ridge, divides Iceland and is effectively splitting it apart. Photographed in Thingvellir, Iceland.
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