How hot is the core and mantle of the earth?

How did the core/mantle/crust structure of the earth evolve?

• Does anyone know what site i could find a convection model---which explains the process of convection as it is thought to occur on the earth?

• Answer:

  It's either God created it or it created itself. After the big bang, matter might have packed and packed together due to gravity. It packs itself, and pulls itself. As it becomes more dense, the center or core becomes hotter and hotter. The denser materials descend to the core, such as iron. Then at the surface, it's cool since it is exposed to space and is far from the core.