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Geologists believe Earth's core is mostly iron due to density estimates from seismological studies and the presence of iron in metallic meteorites.
Geologists think Earth's core contains mostly iron due to the density estimates obtained from seismological studies which indicate that the core is metallic, mainly iron with nickel. This composition is also consistent with metallic meteorites, where iron is abundant. Additionally, the density of Earth's surface layers is lower than the average density of the planet, suggesting denser material in the core.
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