2270 km thick
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The Earth's outer core is about 2,266 kilometers, or 1,408 miles thick. It is composed of iron and nickel and is liquid.
The inner core is about 1,500 miles thick and the outer core is about 1,400 miles thick, together making up the Earth's core that extends to a total of approximately 2,900 miles in thickness.
The smallest part of the Earth is its core, which is made up of a solid inner core and a liquid outer core. The inner core is about 1,500 miles (2,400 kilometers) in diameter, while the outer core is larger, extending to about 1,400 miles (2,200 kilometers) in thickness.
1220 km thick
The outer core is thicker than the inner core. The outer core is about 2,260 kilometers thick, while the inner core is approximately 1,220 kilometers thick.