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Inner core
The Earth's inner core is the Earth's innermost part and according to seismological studies, it has been believed to be primarily a solid ball with a radius of about 1220 kilometers, or 760 miles (about 70% of the Moon's radius). However, with some recent studies, some geophysicists prefer to interpret the inner core not as a solid, but as a plasma behaving as a solid. It is believed to consist primarily of an ironnickel alloy and to be approximately the same temperature as the surface of the Sun: approximately 5700 K (5400 °C).

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