How thick is the Earth's inner core?


Quick Answer

The Earth's inner core is roughly 750 miles thick and it is primarily composed of iron. The iron in the Earth's core reaches temperatures as high as 13,000 degrees Fahrenheit, but remains a solid because of the intense surrounding pressure from Earth's outer layers. The ball-shaped concentration of iron that is the Earth's inner core is always moving, causing all of the planet to be magnetic.

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Full Answer

The Earth's inner core is directly beneath the mantle, which is a layer that consists of semi-solid minerals and rocks and a sheet of hot magma. The Earth's crust borders the mantle and is the outer most layer on the planet. The crust is a solid layer that is responsible for supporting all forms of biological life on Earth.

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