The Earth’s inner core is made mostly of two elements: iron and nickel.

Quick Scoop

  • The inner core is primarily solid iron, making up around 80% of its mass.
  • The second major element is nickel, which is mixed with the iron as an iron–nickel alloy.
  • Small amounts of lighter elements (like sulfur, oxygen, or silicon) may also be present, but the two main elements are iron and nickel.

So, if you are answering a textbook or quiz question asking “which two elements are found in the inner core,” the expected answer is: iron and nickel.

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