Definitions for oceanic crust
oceanic crust

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1. Oceanic crust

   Oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together constitute oceanic lithosphere. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium. It is thinner than continental crust, or sial, generally less than 10 kilometers thick; however, it is denser, having a mean density of about 3.0 grams per cubic centimeter as opposed to continental crust which has a density of about 2.7 grams per cubic centimeter.The crust uppermost is the result of the cooling of magma derived from mantle material below the plate. The magma is injected into the spreading center, which consists mainly of a partly solidified crystal mush derived from earlier injections, forming magma lenses that are the source of the sheeted dikes that feed the overlying pillow lavas. As the lavas cool they are, in most instances, modified chemically by seawater. These eruptions occur mostly at mid-ocean ridges, but also at scattered hotspots, and also in rare but powerful occurrences known as flood basalt eruptions. But most magma crystallises at depth, within the lower oceanic crust. There, newly intruded magma can mix and react with pre-existing crystal mush and rocks.

WikidataRate this definition:4.0 / 7 votes

1. Oceanic crust

   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 magnesium. It is thinner than continental crust, or sial, generally less than 10 kilometers thick, however it is denser, having a mean density of about 2.9 grams per cubic centimeter as opposed to Continental which has a density of about 2.7 grams per cubic centimeter.

How to pronounce oceanic crust?

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How to say oceanic crust in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of oceanic crust in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of oceanic crust in Pythagorean Numerology is: 5

Examples of oceanic crust in a Sentence

1. Natsue Abe:

   The second aim is we want to investigate the boundary between the oceanic crust and the mantle, the third one is we want to know how the oceanic crust formed.

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Oceanic_Crust
2. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=oceanic crust