The upper part of the earth’s crust is called SIAL because
A. it is rich in sodium and aluminium
B. it is rich in silica and aluminium
C. it is rich in magnesium iron
D. it is rich in sulphur and phosphorus.
Answer:B
The upper part of the earth’s crust is called SIAL because
A. it is rich in sodium and aluminium B. it is rich in silica and aluminium C. it is rich in magnesium iron D. it is rich in sulphur and phosphorus.