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Iron is denser than rock, and therefore sinks through the layers of molten liquid rock, to the center.

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12y ago
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12y ago

80% iron and some nickel. Then the rest is smaller elements

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8y ago

It is supposed that the Earth core is composed from iron and nickel.

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11y ago

the inner core

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12y ago

the inner and outer core

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Q: What is made up of mostly iron in the earth?
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