Why did early earth have conditions with extremely high temperatures?

Earth formed similarly to a star, but on a much smaller scale and much faster. The process of atoms fusing from hydrogen to helium to lithium to iron (Earth's core is iron) released a lot of radiation, which made the Earth resemble a mini sun for the first billion or so years after it formed. This fusion process is extremely hot and radioactive.

Early Earth had conditions with extremely high temperatures primarily due to several factors, including the heat generated during its formation through accretion and gravitational compression, intense volcanic activity, and the bombardment of the planet by asteroids and meteorites. Additionally, the atmosphere at that time likely contained high levels of greenhouse gases, such as carbon dioxide and methane, which trapped heat and contributed to the warming of the planet. These combined factors resulted in a hot and hostile environment during the early stages of Earth's history.