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

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Prepare for the IGCSE Environmental Management Test with our quizzes. Study with detailed flashcards and multiple-choice questions. Gain insights on what to expect and get ready to ace your exam!

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.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy