DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Plate boundary. People walking along a pathway in the Thingvellir rift valley, Iceland. The valley, designated a national park, is situated at the boundary between the North American and the European tectonic plates. The two plates are moving apart, dividing rock at the Earth's surface. This walkway leads to the site of Althing, the location of the first Icelandic parliament.
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