Who Melted the Earth

The video addresses a misconception about Earth's heat, initially attributed to pressure. It clarifies that Earth's heat originated from asteroid collisions and gravitational forces during its formation. The video further explains that current heat sources include the transport of heavy elements and nuclear decay, with uranium, thorium, and potassium being significant contributors. Despite cooling, Earth remains hot due to its massive energy content and insulating crust.

Explain the process of nuclear decay and its contribution to Earth's heat.

What is the estimated percentage of Earth's heat that comes from radioactive decay?