Hi! The answer is this, The pressure on the inner core makes the inner core into a solid state, the temperature is hotter that the outer core but it's not hot enough to melt a substance do to the pressure squeezing down from all the layers above! :3
Explanation:
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From the studies done on seismic elastic waves, it has been discovered that the innermost core of the earth is a solid concentric layer. Seismic P and S waves can be propagated through solids but the s-waves are cut off in contact with a liquid medium. This is because s-waves are shear waves and fluids do not shear.
At the outer core, the s waves is cutoff and it reappears in the region of the inner core.
This shows that the inner core is solid.
The inner core is made up of iron and nickel with some other siderophiles.
At the inner core, the pressure is very great. Pressure here is about 350gigapascal.
This huge pressure compresses matter into solids despite the very high temperature.
Also, during the differentiation of the earth, the heavier minerals moves downward to the core due to their density. Metals in the core have density of about 13g/cm³.
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