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

The main component of the Earth's inner core is iron. The inner core is characterized by its solid state and extreme temperatures, which can be comparable to the surface of the sun. Iron, being dense and having a comparatively high melting point, contributes to the inner core's solid structure despite the intense heat.

Additionally, the high pressure found at such depths (around 5,000 to 6,000 kilometers below the Earth's surface) prevents iron from becoming liquid, supporting its solid state. While other elements like nickel are also present in the inner core, iron is the predominant element. The assumption of mainly iron in the inner core is supported by seismic studies and the analysis of meteorites that share similar composition. Thus, the identification of iron as the primary component is crucial for understanding the chemical structure and behavior of Earth's innermost layer.