Continental crust is very buoyant compared with oceanic crust because continental crust is
A. predominantly composed of basaltic rock that contains many air bubbles from successive lava flows.
B. very young and fresh.
C. thinner than the oceanic crust, forming a thin upper skin on the oceanic crust below.
D. predominantly composed of granitic rocks, whereas oceanic crust is composed of basaltic rocks.
Answer: D
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