Oceanic crust has a mafic composition and therefore is denser than continental crust.

Name: Oceanic crust has a mafic composition and therefore is denser than continental crust.
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Mafic rocks, which are rich in iron and magnesium, have a higher density than felsic rocks, which are rich in aluminum and silicon. Since oceanic crust is composed mainly of mafic rocks such as basalt, it has a higher density than continental crust, which is composed mainly of felsic rocks such as granite.

Oceanic Crust Has a Mafic Composition and Therefore Is Denser