Question

Rocks in the Earth's mantle contain a higher percentage of _______ and _______ than do rocks in the Earth's crust.
A.
silicon and oxygen
B.
iron and magnesium
C.
iron and silicon
D.
magnesium and oxygen

Answer 1

B.

Explanation:

B. Magnesium and iron

Answer 2

Answer:

B. iron and magnesium..