oceanic volcanic ridge

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• Ridge — A ridge is a geological feature that features a continuous elevational crest for some distance. Ridges are usually termed hills or mountains as well, depending on size. There are several main types of ridges:*Dendritic ridge: In a typical plateau …   Wikipedia

• 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

• Volcanic arc — Mariana Islands, an oceanic island arc A volcanic arc is a chain of volcanoes positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in a volcanic island arc. Generally they result from the subduction of an… …   Wikipedia

• 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 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

• Oceanic basin — Diagrammatic cross section of an ocean basin, showing the various geographic features Hydrologically, an oceanic basin may be anywhere on Earth that is covered by seawater, but geologically ocean basins are large geologic basins that are below… …   Wikipedia

• Oceanic plateau — An oceanic plateau (also submarine plateau) is a large, relatively flat submarine region that rises well above the level of the ambient seabed.[1] While many oceanic plateaus are composed of continental crust, and often form a step interrupting… …   Wikipedia

• Oceanic zone — Marine habitats The oceanic zone is the deep open ocean water that lies off the continental slopes Littoral zone Intertidal zone …   Wikipedia

• Mount Cayley volcanic field — Coordinates: 50°07′13″N 123°17′26″W / 50.12028°N 123.29056°W / 50.12028; 123.29056 …   Wikipedia

• Chagos-Laccadive Ridge — The Chagos Laccadive Ridge on the upper left side of the picture The Chagos Laccadive Ridge (CLR), also known as Chagos Laccadive Plateau[1], is a prominent volcanic ridge and oceanic plateau extending between the Northern and the Central Indian… …   Wikipedia

• Alpha Ridge — For a ridge in Alaska, see Alpha Ridge, Alaska The Alpha Ridge is a major volcanic ridge under the Arctic Ocean between the Canada Basin (off Ellesmere Island) and the Lomonosov Ridge. It was active during the formation of the Amerasian Basin. It …   Wikipedia