Around 5,400 degrees Celsius to 6,000 degrees Celsius.
hot burning rock and magma
Solid
I know it is nickel
Because the outercore applies pressure to the innercore. Its like the book stack effect, pile up 5 books. Which book has the most pressure on it? The bottom. Now imagine that being a CIRCLE of books, the INNERbook or the innercore would have the most pressure.
crust mantle outtercore innercore
lithosphere asthenospere mesosphere outercore innercore
Heavy (or dense) ones ...mostly iron.
inner core
The centre of the Earth's core - is a solid iron sphere.
The primary source of heat energy driving plate tectonics on Earth is radioactive decay in the planet's interior. This process generates heat through the decay of radioactive elements within the Earth's core and mantle, resulting in convection currents that drive the movement of the planetary plates.
The core of the earth consists of an outercore of liquid nickel and iron revolving around an innercore of solid iron. The revolution of this hot metal creates a magnetic field which we call our magnetosphere. our magnetospere protects us from much of the harmful radiation that comes from the sun.
The Wikipedia article on "Earth" mentions that at the center, the temperature "may" be up to 6000 degrees Celsius.