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 ?
According to Ellon's calculations, the narrow strip underneath the mid-ocean ridge where hot rock wells up to generate the Juan de Fuca Plate, has attenuation levels that are as high as researchers have seen anywhere on the planet.
Ridge push: Hot buoyant mantle lifts and pushes the plates apart at mid-ocean ridges where magma solidifies to form new oceanic lithosphere.
Oceanic plates are continuously forged at mid-ocean ridges, undersea mountain chains created where the edges of two plates are separating.
The compositions of mid-ocean ridge basalt and seawater used in the numerical model are listed in Table 1.
The range of Fe isotope compositions ([delta][sup.56]Fe) of hydrothermal fluids along modern seafloor mid-ocean ridge is from -1.26[per thousand] to -0.14[per thousand] with an average value of - 0.52 [+ or -] 0.28[per thousand] (n = 69) (Figure 1).
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.
By diving beneath they can navigate 3D sea floor terrain including the Mid-Ocean Ridge, the world's longest underwater mountain range which stretches 50,000 km around the globe.
Most hydrothermal vents sit on top of the mid-ocean ridge, the longest continuous mountain range on the planet.
Hydrothermal circulation through mid-ocean ridge flanks: fluxes of heat and magnesium.
The global mid-ocean ridge is an immense submarine mountain chain which virtually encircles the Earth.