oceanic crust -- 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.
oceanic crust That part of the crust underlying the ocean basins. Composed of basalt and having a thickness of about 5 km.
oil shale A mudrock that will yield liquid or gaseous hydrocarbons upon distillation.
Oceanic crust is created at the mid-oceanic ridges and destroyed at the oceanic trenches. Oceanic crust is relatively young age and is being created even today at mid-oceanic rift zones. Maximum age is about 200 million years.
Basalt is thought to be one of the main components of oceanic crust.
Base Flow:
Water that seeps into a stream through a permeable rock or sediment unit that outcrops in the bottom or banks of the stream.
Base Level: ...
To give an example: masses such as microcontinents embedded in oceanic crust moving to a subduction zone may be unable to follow that crust downward and will be "scraped off" along thrust faults to emplace along the growing edge of the continental ...
from rocks containing plagioclase feldspar (above) to rocks that contain none (below). The second event is a chemical discontinuity between ultramafic cumulates and tectonized hartzburgites which has been observed from parts of the oceanic crust that ...
 See also: Crust, Region, Surface, Origin, Basalt
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