What is the inner core made of?

The inner core, which is about 750 miles thick, is made primarily of iron. Unlike the outer core, the inner core is mostly solid. read more

The Earth's inner core is the Earth's innermost part. It is primarily a solid ball with a radius of about 1,220 kilometres, which is about 70% of the Moon's radius. It is composed of an iron–nickel alloy and some other elements. The temperature at the inner core's surface is approximately 5,700 K, which is about the temperature at the surface of the Sun. read more

Earth's inner core is made mostly of iron and nickel, but 5 percent of it has been a mystery for a long time. This new study concludes that it's most likel Just recently, scientists discovered a continent-sized liquid metal “dragon” making its way around the Earth’s outer core. read more

Core. At the center of the Earth is the core, which has two parts. The solid, inner core of iron has a radius of about 760 miles (about 1,220 km), according to NASA. It is surrounded by a liquid, outer core composed of a nickel-iron alloy. The outer core is about 1,355 miles (2,180 km) thick. read more