How earth heated...?

The Earth is heated primarily by the Sun through a process called solar radiation. This energy from the Sun reaches the Earth as sunlight, which warms the surface. The Earth's atmosphere traps some of this heat, a phenomenon known as the greenhouse effect, which helps maintain temperatures suitable for life. Additionally, the Earth's core also contributes to heat through radioactive decay and residual heat from its formation billions of years ago. These combined factors play essential roles in regulating Earth's temperature and climate.