The scientists think Earth's core contains iron because samples of the Earth's crust contain less iron than meteorites.
The Earth crust comprise of three layer of chemical composition including the Crust, Mantle and Core.
The iron which composes the core is heavier than other elements in other layers, thus, causing it to sink to the center of earth.
Also, the scientist though that Earth's core contains iron because samples of the Earth's crust contain less iron than meteorites.
Therefore, the Option D is correct.
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