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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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13y ago

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

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13y ago
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It is supposed that the Earth core is composed from iron and nickel.

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9y ago
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the inner core

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12y ago
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the inner and outer core

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12y ago
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Q: What is made up of mostly iron in the earth?
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