- oceanic plate
- a segment of the earth crust made up of sima. Found mostly, but not exclusively, beneath sea-level.
Geography Dictionary & Glossary for Students \\ ITS Tutorial School (ITS) - Hong Kong.
oceanic plate
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oceanic plate — /oʊʃiænɪk ˈpleɪt/ (say ohsheeanik playt) noun Geology that part of a tectonic plate which lies underneath an ocean, thinner and denser than a continental plate …
plate tectonics — plate tectonic, adj. Geol. a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past… … Universalium
Oceanic core complex — An oceanic core complex (OCC), or megamullion, is a seabed geologic feature that forms a long ridge perpendicular to a mid ocean ridge. It contains smooth domes that are lined with transverse ridges like a corrugated roof. They can vary in size… … 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
Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century … 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 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 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
plate tectonics — the theory concerning the structure of the earth and the processes occurring which explain the configuration of the continents and the location of earthquakes and volcanic activity. There are three types of plate margins, or boundaries between… … Geography glossary
