Question

Estimated temperature of earth's inner core

Answer 1

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.  You can also learn how hot the Inner Core is, how thick it is and some interesting facts about the Inner Core.

Thickness

    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.

Composition

    The Inner Core is a solid ball composed of an element named NiFe.  Ni for Nickel and Fe for Ferrum also known as Iron.  

Temperature

    The Inner Core is about 5000-6000 degrees Celsius.  It melts all metal ores in the Outer Core causing it to turn into liquid magma.

Answer 2

A team of scientists has measured the melting point of iron at high precision in a laboratory, and then drew from that result to calculate the temperature at the boundary of Earth's inner and outer core — now estimated at 6,000 C (about 10,800 F). That's as hot as the surface of the sun.