Answer :
Some sort of chemical reactions occur which causes the layer to remain solid despite the high temperature.
The reason behind the inner core remaining solid at a temperature which is greater than 9000 degrees Fahrenheit is because of very dense, or heavy, materials that are used to make it like iron and nickel.
What is the core of the earth?
The term core here in the context of the earth is used to explain the division of the earth’s layers. It is the earth's layer that is being divided into mainly three layers. The name of these layers is the hot inner core, the molten outer core, the mantle, and the thin crust.
All the layers have their own texture and color. It is the thin crust that is of brown color and all the creatures that are visibly present on this layer. The color of the mantle is red, the molten outer core is of orange color, and lastly, or can be stated as the dense or hot inner core is of yellow color.
Thus, even though it is very hot, these materials present in the earth's inner core don't "melt" very easily, so they stay solid.
Learn more about Earth's core from here:
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