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.
magnesium and oxygen
D.
iron and silicon

Answer 1

The mantle under the crust is about 1,800 miles deep (2,890 km). It is composed mostly of silicate rocks rich in magnesium and iron.

Answer 2

B. iron and magnesium

Step-by-step explanation: