Question

define sima and sial

Answer 1

Sima is the earth's crusts lower layer and contains rocks with an abundance of magnesium silicate minerals, the word Sima is an amalgam of the first two letters of Magnesium and Silica. While Sial makes up a majority of the continental crust, the oceanic crust is primarily composed of Sima.

Answer 2

sima means silicon and magnesium. those are found in layers of the earth.
sial means silicon and aluminum those are also found in the layers of the earth.