NOAA / SCIENCE PHOTO LIBRARY NOAA / SCIENCE PHOTO LIBRARY
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Global topography. Topographical map of the Earth, centred on 0 degrees North, 180 degrees East. The seas and oceans are colour-coded by depth. Turquoise regions descend to around 150 metres, and show the continental shelf. This drops off abruptly at the shelf break, where the continental slope descends to the deep ocean floor (seen as increasingly dark shades of blue). Numerous ocean ridges and trenches are seen on the floor of the Pacific Ocean, including the Mariana Trench (at the bottom of the dark arc at centre left), the deepest point on the Earth, 10.9 kilometres below sea level. Land colours are based on MODIS true-colour data from the Terra satellite in 2004. Highlands are seen as darker regions.
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