1,500mi
1220 km thick
1200 km thick
the inner core is the 6th layer of the earth and the outer core is the 5th layer of the earth and OC is 3150km-6370km thick and the IC is 6370km thick
the inner core is the 6th layer of the earth and the outer core is the 5th layer of the earth and OC is 3150km-6370km thick and the IC is 6370km thick
It is about 1200 km thick
the thickness of the outer core is 2250 km.
inner core
About 760miles thick.
Outer Core:1,370 miles, 2,200 kilometers. Inner Core:780 miles, 1,250 kilometers. 
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.
The outer core is 2900-5100 km thickThe inner core is 5100-6738 km thick