It is estimated that the early Earth housed very high temperatures due to the elevated pressure from gravitational compression. Add to that the impact of meteors and incessant radioactive decay. This era is named the Hadean Age. Hadean is Greek for “the underworld”. The initial Earth was largely molten. Like oil and water, the denser metallic liquid sunk deep into the center, forming the mostly iron core, while the less dense silicate liquids settled on top of it to form a rocky silicate mantle.
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