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The oceanic crust is composed almost entirely of ________ rocks that are underlain by ________ rocks, which makes up the lithospheric mantle.

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The composition of oceanic crust involve mafic rocks, which is been underlay with ultramafic rocks and this serve as composition of lithospheric mantle.

  • oceanic crust can be regarded as the outermost layer of lithosphere of the earth.

  • This is found under the oceans as well as spreading centres on oceanic ridges. Its composition involve mafic rocks, with an underlay ultramafic rocks.

Therefore, mafic; ultramafic are the right answer.

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