Does the temperature of the earth decrease as you move from the crust to the core?

No, the temperature of the Earth actually increases as you move from the crust to the core. The Earth's interior is heated by residual heat from its formation, radioactive decay, and pressure conditions. This temperature gradient averages about 25-30 degrees Celsius per kilometer of depth in the crust, and it continues to rise significantly as you approach the core, where temperatures can reach up to 5,000 degrees Celsius or more.