US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Grand Canyon, Arizona, USA, satellite image. The Grand Canyon was formed by water erosion from the Colorado River over millions of years. It spans 446 kilometres and is 1800 metres at its deepest. Image taken on 25th November 20113 by the OLI (Operational Land Imager) on board the Landsat 8 space satellite. This image covers an area measuring 140 kilometres squared.
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