How thick is the earth's core?

The earth's core is divided into two layers: the outer and inner core. The outer core borders the Earth's mantle and is approximately 1,430 miles in thickness. The inner core has a thickness of 750 miles, giving the core a combined thickness of 2180 miles. 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

The fluctuating temperatures in the core depend on pressure, the rotation of the Earth, and the varying composition of core elements. In general, temperatures range from about 4,400° Celsius (7,952° Fahrenheit) to about 6,000° Celsius (10,800° Fahrenheit). read more