The thickness of the Earth’s inner core is approximately 1,220 kilometers (about 760 miles).
The inner core is a solid sphere composed mostly of iron and nickel. It is surrounded by the outer core, which is in a liquid state. The immense pressure at the Earth’s center means that, despite the high temperatures, the inner core remains solid.
Understanding the thickness of the inner core is crucial for geologists and seismologists as it helps them to comprehend the Earth’s structure and the dynamics of its core. The inner core’s radius is about 1,220 kilometers, making it a relatively small part of the Earth’s overall radius, which is about 6,371 kilometers. This makes the inner core an important yet small component of the entire planet.