The Earth's inner core is mostly made of iron, though whether it's a pure solid is up for debate. Temperatures at the planet's center far exceed the melting point of iron, but high pressure keeps the core from transforming into a liquid. (Some scientists classify it as a plasma that acts like a solid.) Every year, the inner core grows by about a millimeter as parts of the outer core solidify. The process is uneven, and unlikely to ever completely "freeze" the outer core, which would take around 91 billion years. Learn more about Earth, and our neighboring planets, We post Every Day Stay Connected.
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