The type of crust that underlies the ocean basins. It is generally less than 8 km thick, composed predominantly of basalt and gabbro. Its density is about 3.0 g/cm3. The velocities of compressional seismic waves traveling through it exceed 6.2 km/sec. Compare with continental crust.
Basaltic portion of the Earth's crust that makes up the ocean basins. Approximately 5 to 10 kilometers thick. See sima layer.
The type of the Earth's crust that underlies the ocean basins. The oceanic crust is generally about 5-10 km thick; it has a density of 3.0 g/cm3, and compressional seismic wave velocities traveling through it exceed 6.2 km/sec.
The earth's crust where it underlies oceans.
the type of crust underlying the oceans that is typically 8 km thick and somewhat richer in iron and magnesium than the continental crust.
The part of the Earth's crust below the oceans. Oceanic crust is on average only 5km thick.
The relatively thin, dense crust that forms the ocean basins.
The crust beneath the oceans; composed of gabbro and basalt, overlain by sediment.
Crust of the Earth created at spreading ridges, composed entirely of basalt and related rocks. Continental crust develops on top of oceanic crust as a result of subduction and the resulting volcanics. Where no continental crust has formed, the oceanic crust being thinner lies at a lower level, forming the ocean basins.
n. The Earth's crust which is formed at mid-oceanic ridges, typically 5 to 10 kilometers thick with a density of 3.0 grams per centimeter cubed.
part of the Earth crust, the lithosphere, extending under oceans and located above the Moho; mainly composed of basic rocks ( basalt then gabbro) and ultrabasic rocks ( peridotite) and constituting sea floor; thickness from 5 to 8 km.
The outermost layer of rock on the earth's surface, underlying the deep ocean. Oceanic crust is created at mid-ocean ridges where plates are moving apart.
The uppermost layer of the earth beneath the ocean basins. Oceanic crust is constantly forming at mid-ocean ridges and is constantly being destroyed at subduction zones, thus the oldest oceanic crust on the earth is about 160 million years old. Oceanic crust is composed of basalt and is 5-7 km thick.
Oceanic crust is the part of Earth's lithosphere which surfaces in the ocean basins. Oceanic crust is composed of mafic basaltic rocks, or sima. It is thinner, generally less than 10 kilometers thick, but more dense than the continental crust, or sial, having a mean density of about 3.3 grams per cubic centimeter.