What is the thickness of the inner core?
The thickness of the inner core is 1,200 km. 1,200 km(radius) and the density of the inner core is on average about 12.8-13.1g/cm³.
From its boundary with the outer core to the very center of the Earth, about 1220 kilometers.
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Outer core is made up of liquid NiFe, (Nickel and Iron) while that of the inner core is solid.
The inner core is 1216 km and made of solid iron. It is approx 5000 degrees C and it doesnt melt because of everything else pushing down on it.