NOAA / SCIENCE PHOTO LIBRARY NOAA / SCIENCE PHOTO LIBRARY
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Mid-Atlantic Ridge, topographical map. Elevation is colour-coded. On land, low-lying areas are green, with yellow, orange and red indicating higher elevations. In the oceans, the shallow waters of the continental shelf are turquoise, with deeper blues showing deeper water. The mid- Atlantic Ridge is a long submarine mountain range that runs from nearly the North Pole to the South Atlantic Ocean. It is formed by the upwelling of magma as the continents drift apart, which causes the Atlantic Ocean to grow by 5-10 centimetres annually. The ridge passes through the island of Iceland (upper centre). Between west Africa and eastern Brazil it is divided by the east-west Romanche Trench.
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