Which layer of earth does not contain silicates? outer core upper mantle oceanic crust asthenosphere?

The outer core does not contain silicate.

Option A

Explanation:

The mantle and the crust are made of silicate. Outer core contains nickel and iron. The core is the innermost layer of the earth and contains iron and nickel which are very hot materials because of the hot temperature of the core. The earth when cooled down, moved the high density materials like iron and nickel into the deep surface and low density materials moved to the surface.

a characteristic is a deep cut in the earth or left over rock aka till.  

answer conditional instability;