Context: The Earth's inner core is the Earth's innermost part. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 70 % of the Moon's radius. It is composed of an iron -- nickel alloy and some light elements. The temperature at the inner core boundary is approximately 5700 K (5400 ° C).\n\nQuestion: composition of the inner core of the earth? Okie... think carefully first, then make a decision:
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The relevant information to answer the above question is: It is composed of an iron -- nickel alloy and some light elements. So, the answer is an iron -- nickel alloy and some light elements.
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