What is the primary component of Earth's inner core?

The primary component of Earth's inner core is solid iron. The inner core is situated deep within the Earth, beneath the outer core, and is under immense pressure. This pressure causes iron, which is in a liquid state in the outer core, to solidify despite the high temperatures that exist at that depth.

The composition of the inner core is primarily iron, with smaller amounts of nickel and other lighter elements. The solid state of the inner core is a result of the incredibly high pressures that prevent the iron from remaining in a liquid state, even at temperatures that would normally melt it. Understanding this helps clarify the structure of the Earth's layers and the conditions that exist within them.