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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