Why is the earth crust called Sial?
A. Because it consists of silica and alumina.
B. Because it consists of silicon and aluminium.
C. Because its constituents are silica and magnesium.
D. Because it consists of nickel and ferrous.
Answer:A
Why is the earth crust called Sial?
A. Because it consists of silica and alumina. B. Because it consists of silicon and aluminium. C. Because its constituents are silica and magnesium. D. Because it consists of nickel and ferrous.