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Deep beneath our feet, at a staggering depth of over 5,100km, lies Earth's inner core — a solid ball of iron and nickel that plays a crucial role in shaping the conditions we experience on the surface. In fact, without it we'd be unlikely to even exist.
This process of freezing releases elements, such as oxygen and carbon, which aren't compatible with being in a hot solid. It creates a hot, buoyant liquid at the bottom of the outer core. This level of supercooling implies that the core would have needed to be below its melting point for the entirety of its history , which presents additional complications.
If the core froze relatively recently, the current thermal state at the inner core–outer core boundary indicates how much the combined core might have been below its melting point when the inner core first began to freeze. This suggests that, at most, the core could have been
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