Earth’s inner core is not rock but a sphere of solid iron-rich metal, smaller than the Moon yet probably more massive. As the planet gradually loses heat, liquid metal freezes onto its surface, expanding it by roughly a millimetre each year.
The centre of Earth is easy to imagine wrongly. It is not a cavern, not a furnace of molten rock, and not a smaller version of the mantle pressed into a ball. The inner core is a metal object…
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