What is the thick, hot, rocky layer around the outer core called?

The Earth’s structure is made up of six layers. The top layer is the crust. The crust took on a solid form billions of years ago. It is broken up into huge, very thick 'plates'. The plates then rest upon a rocky mantle. Shifting of the plates can cause major alterations to the Earth’s surface by way of events such as earthquakes and tsunamis.