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Related to mid-oceanic ridge: rift valley, Subduction zone
mid-oceanic ridge[′mid‚ō·shē¦an·ik ′rij]
A continuous, median, seismic mountain range on the floor of the ocean, extending through the North and South Atlantic oceans, the Indian Ocean, and the South Pacific Ocean; the topography is rugged, elevation is 0.6-1.8 miles (1-3 kilometers), width is about 900 miles (1500 kilometers), and length is over 52,000 miles (84,000 kilometers). Also known as mid-ocean ridge; mid-ocean rise; oceanic ridge.