Final answer:
The temperature increases as you move towards the Earth's center due to residual heat, radioactive decay, and pressure-induced heating causing friction and heat.
Step-by-step explanation:
As you travel closer towards the center of the Earth, the temperature generally increases. This is not due to heat being generated at the core, but rather due to residual heat from the planet's formation as well as heat produced from radioactive decay and pressure-induced heating of materials. The closer you get to the core, the hotter it becomes, which is a result of increasing pressure and density of the Earth's materials causing friction and heat.