Deep below the crust of Earth, past the thick mantle and liquid outer core, lies a 1,220-kilometer (760 mile) ball of solid inner core.
– extremely high temperatures and pressures break apart each water molecule, leaving the oxygen ions to form a solid, while the hydrogen ions float around more like a liquid.
In the hot inner core of Earth, the team used computer simulations of how seismic waves would travel through different combinations of elements, and discovered that alloys of iron with carbon, hydrogen, and oxygen could work the same way as superionic water. The iron atoms were 'solid' in the crystalline lattice structure, whereas the carbon, hydrogen, and oxygen molecules would diffuse through the medium, creating the liquid-like element."The solidification of iron at the inner core boundary does not change the mobility of these light elements, and the convection of light elements is continuous in the inner core."
This work is unlikely to be the last word on the subject. The paper's conclusions give a good model for this softer and less dense pure iron, but it doesn't answer another question about the inner core –
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