mid-ocean ridge

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mid-o·cean ridge

 (mĭd′ō′shən)
n.
1. Any of various underwater mountain ranges forming a chain that extends almost continuously for about 66,000 kilometers (41,000 miles) through the North and South Atlantic Oceans, the Indian Ocean, and the South Pacific Ocean at the boundaries between divergent tectonic plates. Magma escapes from rifts along the tops of these ranges, adding new material to the earth's crust.
2. The system of these mountain ranges considered as a single geologic feature.

mid-o·cean ridge

(mĭd′ō′shən)
A long mountain range on the ocean floor, extending almost continuously through the North and South Atlantic Oceans, the Indian Ocean, and the South Pacific Ocean. A deep rift valley is located at its center, from which magma flows and forms new oceanic crust. As the magma cools and hardens it becomes part of the mountain range. See more at tectonic boundary.
References in periodicals archive ?
Moscow claims this underwater ridge by historic right.
The new Russian submission claimed that the underwater ridge systems are extensions of Russia's continental shelf.
The passage of this warmer water was made easier by the unpinning of the ice shelf from an underwater ridge. The ridge had, in effect, acted as a wall preventing warmer water from getting to the thickest part of the shelf.
Detailed measurements of water temperature, combined with a computer model of ocean circulation, shows that the reduced melting in 2012 was because less warm, deep water was able to make it across an underwater ridge that separates Pine Island Glacier from the Southern Ocean.
Most of the Irish oil and gas deposits have been pinpointed along an underwater ridge known as the Atlantic Margin which runs parallel to our western shore.
Massive reserves lie in an underwater ridge off the West Coast - and there is also enough gas to supply Western Europe for decades to come, Government figures reveal.
Early versions of these vehicles carried several 35-mm cameras and a variety of underwater sensors, which made possible extended undersea mapping expeditions, such as the exploration of several hundred miles of the East Pacific Rise underwater ridge. However, lacking real-time video, the remote navigators of these rudimentary vehicles "swam" blind, relying strictly on sonar readings.
Images sent back by a robot submarine from beneath the ice revealed the presence of an underwater ridge. Some time during the 1970s, the glacier detached from this ridge, allowing warm water rising from the deep ocean to gain access to deeper parts of the glacier, thinning the ice.
On the same cruise, a group led by Jenkins, a researcher at British Antarctic Survey and study co-author, sent a robot submarine beneath the ice shelf, revealing an underwater ridge. The researchers surmised that the ridge had once slowed the glacier like a giant retaining wall.

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