mid-ocean ridge


Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia.

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 ?
New research, however, shows plate dynamics are driven significantly by the additional force of heat drawn from the Earth's core, which also challenges the theory that underwater mountain ranges, known as mid-ocean ridges, are passive boundaries between moving plates.
These topographic alignments are approximately parallel to the ridge segments and to the pseudofaults, showing that their origin took place at the axis of the mid-ocean ridge (Fig.
The seafloor of the northeastern Pacific Ocean is typical of most oceanic regions in that it features three different kinds of volcanic edifices that produce primarily basaltic volcanic rocks and their intrusive equivalents: mid-ocean ridges, where new oceanic crust is produced; near-ridge seamounts, which form adjacent to mid-ocean ridges but are not part of the mid-ocean ridge system itself; and intraplate seamounts that form well away from plate boundaries, such as the Hawaii-Emperor seamount chain (Fig.
As it pumps lava up, it forces each wall of the mid-ocean ridge to move aside," explains Lutz.
Hydrothermal circulation through mid-ocean ridge flanks: fluxes of heat and magnesium.
England, and head of the steering committee for the British Mid-Ocean Ridge Initiative (Bridge).
As magma at a mid-ocean ridge axis cools, magnetic minerals in the newly forming rocks align with the direction of Earths magnetic field.
Distribution patterns and structuring factors of deepwater demersal fishes on a mid-ocean ridge.
The extrapolation of the mid-ocean ridge geodynamic setting, as the unique locus to create ophiolites, to other settings opened the door to the possibility of Precambrian ophiolites.
On the mid-ocean ridge you have sea water percolating through hot rocks and eventually this produces gasses which these life forms live off.