The inner core is the Earth's innermost layer, located about 3,200 miles beneath the surface. It is primarily composed of solid iron and nickel, with temperatures reaching up to 9,932°F (5,500°C). Despite the extreme heat, the immense pressure keeps the inner core in a solid state. Surrounding the inner core is the outer core, which is liquid and responsible for generating the Earth's magnetic field through the movement of molten metals. The inner core plays a crucial role in the planet's geology and helps scientists understand the Earth's formation and structure.