How does temperature change between earth surface and it's core?

Temperature increases significantly from the Earth's surface to its core. The surface temperature averages around 15 degrees Celsius (59 degrees Fahrenheit), while the temperature in the core can reach approximately 4,000 to 6,000 degrees Celsius (7,200 to 10,800 degrees Fahrenheit). This gradient is primarily due to the heat generated from the Earth's formation, radioactive decay, and pressure increases as one moves deeper into the Earth. Consequently, the temperature rises by about 25 to 30 degrees Celsius per kilometer of depth in the crust.