Solve this multiple-choice question and choose the correct option.

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Earth layers (Sial vs. Sima): The heavier silicates called “Sima” (silica + magnesium) are most abundant in which part of Earth? Think of basaltic composition and oceanic crust distribution. Choose the correct option.

Difficulty: Easy

Crust
Core
Mantle
Ocean floors

Correct Answer: Ocean floors

Explanation:

Given data

Identify where silica–magnesium (sima) materials dominate.

Concept/ApproachIn classical physiography, sial (Si + Al) characterizes continental upper crust (granitic), whereas sima (Si + Mg), akin to basaltic composition, dominates the oceanic crust forming the ocean floors. The mantle is ultramafic (peridotitic) and not what is meant by sima in this context.

Final AnswerOcean floors

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