Sample TESTs for students/parents to know what's on their platter after making payment to us.
INTERIOR OF THE EARTH
The uppermost layer over the earth’s surface is called the crust.
The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina).
The oceanic crust mainly consists of silica and magnesium; it is therefore called sima (si-silica and ma-magnesium).