What is the inner core of the Earth?

The Inner Core is about 1250 km thick and is the second smallest layer of the Earth. Although it is one of the smallest, the Inner Core is also the hottest layer. 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 (760 miles), which is about 70% of the Moon's radius. It is composed of an iron–nickel alloy and some other elements. read more

The Inner Core is the final layer of the Earth. It is a solid ball made of metal. To learn about what metal the Inner Core is made of, read this section about the Inner Core. read more

The earth's inner core is approximately 1500 miles wide. It is estimated to be approximately 1,802 miles below the earth's surface (crust). Some scientists believe that the earth's inner core spins at a faster speed than the rest of it - at a rate of 2/3rds of a second faster. read more