Thanks for your interesting question. The Earth
has layers and these layers of the Earth are made
up of different materials, mostly because they
have different densities. As an example, if you
have a jar with oil, water, and honey in it, the
oil will rise to the top and the honey will sink
to the bottom while the water will stay in
This occurs because the oil is the
less dense liquid and floats to the top, whereas
the honey is more dense and sinks to the bottom.
Early in its history, the Earth was very hot and
almost like a liquid which allowed the denser
materials in the earth (such as iron and other
metals) to sink to the center of the Earth and the
less dense materials to float to the surface.
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