👉Deep below Earth’s surface lies the core, where temperatures are estimated to range from about 5,200°C to 6,000°C — nearly as hot as the Sun’s visible surface. However, unlike the Sun, Earth’s core does not generate energy through nuclear fusion. Its heat mainly comes from the slow radioactive decay of heavy elements such as uranium and thorium, along with leftover heat from the planet’s formation more than 4.5 billion years ago. This enormous internal heat powers many of Earth’s dynamic proce