Why is the inner core in solid state despite the high temperature?

Why is the inner core in solid state despite the high temperature?
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The inner core is solid because it is made of very dense, or heavy, materials - like iron and nickel. Even though it is very hot, these materials don't melt very easily, so they stay solid. Answer 3: It turns out that many materials can be a solid at a higher temperature if the pressure is also higher.
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