Question

The upper mantle is made of rock that is rich in oxygen O, iron Fe, magnesium Mg, and aluminum Al.

It extends to approximately 1800 ?
below the surface.

Answer 1

Answer: Mantle.

Step-by-step explanation:

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.