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Why is inner core in Earth solid though it has a higher temperature than the liquid outer core?
Answer 1:

The melting point of any substance depends on Temperature and on PRESSURE. So, the molten outer core at about 5000 Kelvin degrees of temperature is at a low enough pressure; this makes the iron of the core to be in liquid state. But because the Temperature of the inner core is almost the same, BUT THE PRESSURE is larger, then the inner core can be solid.



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