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Mid-Atlantic Ridge

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia, Hutchinson 0.03 sec.
Mid-Atlantic Ridge: see Atlantic Ocean Atlantic Ocean [Lat.,=of Atlas], second largest ocean (c.31,800,000 sq mi/82,362,000 sq km; c.36,000,000 sq mi/93,240,000 sq km with marginal seas).

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Mid-Atlantic Ridge

Submarine ridge lying along the floor of the central Atlantic Ocean. It is a long mountain chain running about 10,000 mi (16,000 km) in a general but curving north-south direction from the Arctic Ocean to the southern tip of Africa. The mountains sometimes reach above sea level, forming such islands or island groups as Ascension, the Azores, St. Helena, and Tristan da Cunha.


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It was found along the Mid-Atlantic Ridge, a volcanic mountain range that splits the Atlantic Ocean from north to south.
That well-established model began to be questioned 8 years ago, when researchers exploring some sections of the slow-spreading Mid-Atlantic Ridge found small, widely dispersed areas of exposed mantle rock on the seafloor.
They rest on a million-year-old piece of Earth's crust at the base of a 14,000-foot submerged mountain in the Mid-Atlantic Ridge.
 
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