about 6,100 degrees Celsius. The outer core beginnings where the mantle stops and it extends further down to the center 2,250 kilometers. The inner core is about 6,400 kilometers below the earths surface. the temperature at the inner core of the earth is at the high is about 7,000 degrees Celsius. But compared with the sun the earth's temperature at the center of the earth is only about the outer reign of the sun. Ok, first off, like someone already said, Fire requires oxygen. Heat does not. Second, for the next part of this explanation, we like to explain the Earth as being like an egg. The core is like the yolk. The mantle is like the white part. The crust is likt the shell. Here's the thing about the center of the Earth. With gravity pulling all the mass of the entire planet inward (or down) there's a lot of energy being focused on the stuff in the core. All that energy is manifested as heat. That melts what might otherwise be solid material into liquid, but at the same time, there's a lot of pressure pushing in from all sides (the gravity again -- and you can see that it's kind of a feedback system. That is to say, it's like a loop, and it feeds itself) and this pressure wants to condense the core into a solid. All that energy of heat and pressure releases itself into the mantle of the Earth as heat. The mantle contains