What is inner core definition?

The inner core is the most central layer of the Earth, located at the center of the planet. It is a solid metallic sphere with a radius of approximately 1,220 km (758 mi). The inner core is composed primarily of iron and nickel, with smaller amounts of other elements, including sulfur and oxygen. Despite its high temperature of around 5,500°C (9,932°F), the inner core remains solid due to the immense pressure it is under from the weight of the surrounding Earth. The inner core is believed to play a crucial role in generating the Earth's magnetic field, which protects the planet from harmful solar radiation and helps maintain balance in its atmosphere. Researchers continue to study the inner core to gain a better understanding of the Earth's structure, composition, and dynamics.