How did the Earth’s inner core freeze solid?
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A high concentration of carbon in Earth’s inner core may explain the long-standing mystery of how the deepest part of our planet froze solid, the process that triggered the magnetic field that supports life on the surface.
The Earth’s inner core presents a paradox to geophysicists: it first formed as a mass. especially liquid iron ballthen it started to solidify in the last billion years. To initiate this freezing process in a bare iron object, it would need to be cooled to at least 700 kelvins…
