DR FRED ESPENAK / SCIENCE PHOTO LIBRARY DR FRED ESPENAK / SCIENCE PHOTO LIBRARY
Computer map centred on the Americas showing the oceanic ridges. These are visible as lighter blue formations on the oceanic floors and are the boundaries, which are drifting apart, between the plates carrying the continents and the oceanic floors. The Mid-Atlantic ridge in the Atlantic Ocean separates the North and South American plates from the Eurasian and African plates. The East Pacific ridge runs almost parallel to the South American coast in the Pacific Ocean. In the Indian Ocean lies the Southeast Indian Ocean ridge (bottom right) that splits near Madagascar into the Southwest Indian Ocean ridge and the Carlsberg ridge which points towards the Arabian Sea.
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