MDA INFORMATION SYSTEMS / SCIENCE PHOTO LIBRARY MDA INFORMATION SYSTEMS / SCIENCE PHOTO LIBRARY
Grand Canyon. Coloured optical and infrared, Landsat satellite image of the Grand Canyon, Arizona, USA. North is at top. Arid areas are brown and purple, forests are green and water is black. The Grand Canyon is a massive gorge that has been formed by the Colorado River eroding into the Earth. It is seen as a fissured line snaking from Lake Powell (top right) to Lake Mead (far left). The 6-million-year-old Grand Canyon system is around 446 kilometres long, 29 kilometres wide and 1.5 kilometres deep. The contrasting rock colours (purple, blue and brown) in the image are due to the presence of coloured volcanic rocks.
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