Earth's Inner Core Is Solid Despite Extreme Heat

The Earth's inner core, located about 5,150 kilometers beneath the surface, reaches temperatures around 5,500 degrees Celsius. Despite this extreme heat, the inner core remains solid due to immense pressure that prevents iron and nickel from melting. Scientists study seismic waves from earthquakes to understand the Earth's internal layers, revealing that the outer core is liquid while the inner core is a solid sphere primarily composed of iron and nickel with a radius of about 1,220 kilometers.

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