Question

Why do scientists think earths core contains iron?

A iron is lighter than silicon
B iron is a heavy element and would sink into the planet
C the crust also contains a great deal of iron
D iron does not conduct electricity

Answer 1

the best answer seems to be B. iron is a heavy element and would sink into the planet because iron is a metal so it is heavy and when something is heavy it sinks the lowest it can go, so when the earth was developing, iron and other heavier substance sunk towards the middle of earth

Answer 2

Scientists don't think the Earth's core contains iron, they know it is mostly made of iron.

Step-by-step explanation:

Geologists study internal rumbles caused by earthquakes which send rippling seismic waves through the whole Earth. Seismic waves bent as they pass through different layers because their density varies, since they are made of different materials. Geologists have calculated the density of iron and they can infer that the inner and outer core as almost entirely made of iron. What they do not agree upon 100% is about the outer core being melted iron or solid iron.