The inner core is solid.what keeps in it phase?
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Answer:
Good question! Various lines of evidence (mostly from the seismic waves generated by earthquakes) suggest that the inner core of the Earth is solid. The inner core must also be very hot, as it is “insulated” by the outer core and the mantle that surround it (the outermost layer is the crust, but it’s so think compared to the other layers that it probably doesn’t insulate much). If it’s so hot, then why is it solid? Basically, the pressure is so high that the iron and nickel (and other elements) in the core cannot melt. Generally, increasing pressure increases the melting temperature of a solid “phase” (this is not always true). The pressure at the boundary of the inner core is approximately 330 gigapascals (GPa; Alfè et al., 1999). That’s about 3.3 million times the pressure of the atmosphere at sea level! Under these extremely high-pressure conditions, the core is stable as a solid phase.
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