Which term describes the composition of the oceanic crust, rich in silica and magnesium?

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Multiple Choice

Which term describes the composition of the oceanic crust, rich in silica and magnesium?

Explanation:
Understanding the difference between continental and oceanic crust helps. The oceanic crust is basaltic and thus silica-bearing but magnesium-rich. The term sima describes this composition (silica + magnesium). Sial refers to silica + aluminium and is linked to granitic continental crust. Granite is a continental rock, not oceanic. Basalt is a common oceanic rock, which fits sima, but the question is about the composition term itself. So sima is the best fit.

Understanding the difference between continental and oceanic crust helps. The oceanic crust is basaltic and thus silica-bearing but magnesium-rich. The term sima describes this composition (silica + magnesium). Sial refers to silica + aluminium and is linked to granitic continental crust. Granite is a continental rock, not oceanic. Basalt is a common oceanic rock, which fits sima, but the question is about the composition term itself. So sima is the best fit.

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