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Mid-ocean ridge
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- The Mid-Atlantic Ridge (MAR) is known as a mid-ocean ridge, an underwater mountain system formed by plate tectonics. It is the result of a divergent plate boundary that runs from 87° N – about 333 km (207 mi) south of the North Pole – to 54 °S, just north of the coast of Antarctica.
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What is a mid-ocean ridge?
Mid-Atlantic Ridge, submarine ridge lying along the north-south axis of the Atlantic Ocean; it occupies the central part of the basin between a series of flat abyssal plains that continue to the margins of the continental coasts. Learn more about the Mid-Atlantic Ridge.
- The Editors of Encyclopaedia Britannica
Definition. The Mid-Atlantic Ridge is a submerged mountain range in the Atlantic Ocean, running between North America and Eurasia on the northern section and between South America and Africa on the southern section.
- Description
- Notable Features
- History of Exploration
The Mid-Atlantic Ridge (MAR) is known as a mid-ocean ridge, an underwater mountain system formed by plate tectonics. It is the result of a divergent plate boundary that runs from 87° N – about 333 km (207 mi) south of the North Pole – to 54 °S, just north of the coast of Antarctica. Like other ocean ridge systems, the MAR developed as a consequence...
As noted, the ridge (while mainly underwater) does have islands and island groups that were created by volcanic activity. In the Northern Hemisphere, these include Jan Mayen Island and Iceland (Norway), and the Azores (Portugal). In the Southern Hemisphere, MAR features include Ascension Island, St. Helena, Tristan da Cunha, Gough Island (all UK te...
The ridge was initially discovered in 1872 during the expedition of the HMS Challenger. In the course of investigating the Atlantic for the sake of laying the transatlantic telegraph cable, the crew discovered a large rise in the middle of the ocean floor. By 1925, its existence was confirmed thanks to the invention of sonar. By the 1960s, scientis...
The Mid-Atlantic Ridge is a prime example of seafloor spreading occurring at a divergent boundary, where two tectonic plates are moving away from each other. As these plates separate, magma rises from below the Earth's crust to fill the gap, creating new oceanic crust.
Mid-Atlantic Ridge. The North American and Eurasian Plates are moving away from each other along the line of the Mid Atlantic Ridge. The Ridge extends into the South Atlantic Ocean between the South American and African Plates.
The Mid-Atlantic Ridge is a mid-ocean ridge (a divergent or constructive plate boundary) located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world. In the North Atlantic, the ridge separates the North American from the Eurasian Plate and the African Plate , north and south of the Azores Triple Junction .
Definition. The Mid-Atlantic Ridge is an underwater mountain range that runs down the center of the Atlantic Ocean, formed by the divergent tectonic plates of the Eurasian and North American plates in the north, and the South American and African plates in the south.
