Earth's inner core
Innermost part of Earth, a solid ball of iron-nickel alloy / From Wikipedia, the free encyclopedia
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Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth’s radius or 70% of the Moon's radius.[1][2]
There are no samples of Earth's core accessible for direct measurement, as there are for Earth's mantle.[3] Information about Earth's core mostly comes from analysis of seismic waves and Earth's magnetic field.[4] The inner core is believed to be composed of an iron–nickel alloy with some other elements. The temperature at the inner core's surface is estimated to be approximately 5,700 K (5,430 °C; 9,800 °F), which is about the temperature at the surface of the Sun.[5]