Continuous, median, seismic mountain range on the ocean floor, running through the North and South Atlantic oceans, the Indian Ocean, and the South Pacific Ocean.
A continuous, volcanically active mountain range extending through the North and South Atlantic Oceans, the Arctic Ocean, the Indian Ocean, and the South Pacific Ocean. It is a broad, fractured swell with a central rift valley, and usually extremely rugged topography. It is 1-3 km in elevation, about 1500 km in width, and over 84,000 km in length. According to the theory of sea-floor spreading, new oceanic crust is created by volcanic eruptions at the mid-ocean ridge.