Question : The oceanic crust mainly consists of _____ and _____.
Option 1: silica, alumina
Option 2: silica, magnesium
Option 3: magnesium, alumina
Option 4: iron, alumina
Correct Answer: silica, magnesium
Solution : The correct option is silica, magnesium.
The term "SiMa" refers to the composition of the upper layer of the Earth's mantle and the overlying oceanic crust. "Si" stands for silicon and "Ma" stands for magnesium. The SiMa layer is characterised by a higher concentration of magnesium and lower concentrations of silicon compared to the continental crust.
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