Earths core
There is a place on Earth that we have never seen. It is a place of unimaginable heat and pressure, where no life could survive. Yet without it, we would perish for it holds the key to our precarious existence on this planet.
The Earth is like an onion it has a very thin Crust (The surface of which we all live) then the Mantle followed by a solid inner core and finally a posible central Uranium nuclear reactor.
2000 miles below the Earth's surface, there is a vast ocean of molten iron. The spinning outer core of the Earth generates a protective magnetic shield around the planet, defending life from lethal space radiation.
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.
Heat from the Earth's core
Current speculation is either the heat from the Earth's Core comes from the mantle being partially heated by radioactive decays of Uranium-238, Uranium-235, Thorium-232, and Potassium-40 and also from frictional heating as the moulton core rotates.
or there is a Uranium fission reactor in the centre of the inner solid core, This five mile in diameter sphere of uranium acts as a natural nuclear reactor.