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Oceanic Crust Is Primarily, The The oceanic crust is the part of Earth's lithosphere that is under the ocean basins. The thickness of the oceanic crust ranges from 5 to 10 kilometers beneath the ocean floor, depending on Oceanic crust differs from continental crust in composition, density, thickness, and age. It has a distinctive basaltic composition Oceanic crust is primarily made of a type of rock called basalt. Over time, the igneous rock of the oceanic crust gets covered with layers of sediment, which eventually become Over time, the igneous rock of the oceanic crust gets covered with layers of sediment, which eventually become sedimentary rock, including limestone, The oceanic crust is the outermost layer of Earth's surface that lies beneath the ocean basins. The oceanic crust is primarily composed of igneous rocks, which form from the cooling and solidification of magma. The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase [feldspar] and pyroxene). Oceanic crust is predominantly made of mafic rocks like basalt and gabbro, which are rich in As one would expect, the oceanic crust is very young near the spreading ridges (Figure 18. The oceanic crust is primarily made of basalt, an igneous rock rich in iron and magnesium, which gives it its high density. oceanic crust, the outermost layer of Earth’s lithosphere that is found under the oceans and formed at Oceanic crust is about 6 km (4 miles) thick. The oceanic crust is primarily composed of basalt, a dense, dark volcanic rock. chn dm 4z6u srhj 5lopc 3vt bqmp9jt tmr 310n4 9ebv11