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Why is crustal thickness generally lower beneath ocean floors?

Answer and explanation

Correct answer: Because oceanic crust is mainly basaltic, denser, and comparatively thin

Oceanic crust is composed mainly of basaltic (mafic) rocks and is generally about 5–10 km thick. It is denser and much thinner than continental crust because it forms as a relatively thin layer at mid-ocean ridges. Seawater pressure does not cause the crust to be thin. Exam tip: remember oceanic crust as thin, dense, and basaltic; continental crust as thicker, less dense, and granitic.

Related tags

Oceanic CrustCrustal ThicknessBasaltic CrustEarth InteriorContinental CrustInterior Structure Of The EarthInterior Of The EarthGeography

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