oceanic ridge

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• oceanic ridge — Continuous, submarine mountain chain extending approximately 50,000 mi (80,000 km) through all the world s oceans, separating them into distinct basins. The main ridge extends down the middle of the Atlantic Ocean, passes between Africa and… …   Universalium

• mid-oceanic ridge — [mid ō′shənmid ō΄shē an′ik] n. the continuous, double ridged chain of mountains on the ocean floor, extending through the middle of the Atlantic Ocean and into the Indian and Pacific oceans: also called mid ocean ridge [mid ō′shən] * * * …   Universalium

• mid-oceanic ridge — [mid ō′shənmid ō΄shē an′ik] n. the continuous, double ridged chain of mountains on the ocean floor, extending through the middle of the Atlantic Ocean and into the Indian and Pacific oceans: also called mid ocean ridge [mid ō′shən] …   English World dictionary

• Oceanic trench — Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric scale long but narrow topographic depressions of the sea floor. They are also the… …   Wikipedia

• mid-oceanic ridge — noun any of an interconnected system of broad submarine rises formed by plate tectonics Syn: mid ocean ridge …   Wiktionary

• Oceanic crust — Age of oceanic crust. The red is most recent, and blue is the oldest. Oceanic crust is the part of Earth s lithosphere that surfaces in the ocean basins. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and… …   Wikipedia

• oceanic — /oh shee an ik/, adj. 1. of, living in, or produced by the ocean: oceanic currents. 2. of or pertaining to the region of water lying above the bathyal, abyssal, and hadal zones of the sea bottom. Cf. neritic, pelagic. 3. immensely large; vast: an …   Universalium

• ridge — ridgelike, adj. /rij/, n., v., ridged, ridging. n. 1. a long, narrow elevation of land; a chain of hills or mountains. 2. the long and narrow upper edge, angle, or crest of something, as a hill, wave, or vault. 3. the back of an animal. 4. any… …   Universalium

• Oceanic lithosphere — is typically about 50 100 km thick (but beneath the mid ocean ridges is no thicker than the crust), while the continental lithosphere has a range in thickness from about 40 km to perhaps 200 km; the upper 30 to 50 km of the… …   Wikipedia

• mid-oceanic ridge —   an elongated range of undersea mountains formed by the extrusion of lava, combined with the upward pressure of a convection plume, at a divergent plate margin …   Geography glossary

• Mid-ocean ridge — Oceanic ridge, including a black smoker A mid ocean ridge is a general term for an underwater mountain system that consists of various mountain ranges (chains), typically having a valley known as a rift running along its spine, formed by plate… …   Wikipedia