Question

The physical evidence that the core is composed mostly of iron is ________________.

• A. the known mass of Earth requires material of high density at the core.
• B. volcanoes erupt material from the core to the surface.
• C. scientists have sampled the core and determined its composition.
• D. all of these.

Answer 1

Answer: (B)

volcanoes erupt material from the core to the surface.

Outer core: It is located beneath mantle. The outer core is composed of the melted metals like nickel and iron.

Inner core: It is composed of an iron–nickel alloy and some light elements.

Thus core is mostly constituted by iron. This fact can be known by the measurement of densities of various layers of earth. At the core there is a higher density and this density could only be possible by higher amounts of iron present in the core.