Correct Answer: silica, alumina

Solution : The correct answer is silica, alumina.

Alumina and silica comprise the bulk of the continental mass's mineral composition. As a result, it is referred to as sial (si-silica and al-alumina). The continental crust is made up of sial. Silica and alumina are referred to as sial. The oceanic crust has a comparable makeup. The terms silica and magnesium are referred to as simas.