Earth's last layer the inner core
The inner core is a solid and it is about 4300 degrees celcius. The closer you are to the inner core the more the gravitional pull. The farther you are, the less gravitational pull. Scientists think the inner core is melting and moving.It is in the video below.
http://www.leeds.ac.uk/ruskinrocks/Geology%20pictures%20and%20files/internal%20earth%20structure.jpg