Iron is denser than rock, and therefore sinks through the layers of molten liquid rock, to the center.
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The Earth's outer core is composed of liquid iron & nickel
Mostly iron, oxygen, silicon, magnesium, sulfur, nickel, and calcium.
The Inner (solid) and Outter (liquid) Core are made up of Nickel and Iron.
The three main layers of the earth are the Core, Mantle and Crust. The Core is mostly made from iron and nickel, the Crust from oxygen, silicon and aluminum and the mantle silicon,oxygen,iron and magnesium.
earth is made of two types of gasses that is 78% Nitrogen and 21% oxygen