SOLAR SYSTEM

Detailed explanation-1: -The inner core is a hot, dense ball of (mostly) iron. It has a radius of about 1, 220 kilometers (758 miles). Temperature in the inner core is about 5, 200° Celsius (9, 392° Fahrenheit). The pressure is nearly 3.6 million atmosphere (atm).

Detailed explanation-2: -Earth’s core consists of a solid iron-nickel ball rotating within a layer of liquid metal.

Detailed explanation-3: -Inner Core Composition and Formation The solid spheroid that comprises the inner core of the Earth is made of different metals, specifically, mostly iron and nickel. Siderophiles, or elements that dissolve in iron, are also found in the inner core. These elements include gold, cobalt, and platinum.