View of the primal earth early in formation

The melting of the Earth due to radioactive and gravitational heating takes place, which leads to its differentiated interior structure as well as the formation of volcanoes causing outgassing of molecules such as water, methane, ammonia, hydrogen, nitrogen, and carbon dioxide.

Atmospheric water is photodissociated by ultraviolet light to oxygen atoms which are then incorporated into an ozone layer and hydrogen molecules which escape into space. Water also condenses, forming an almost non-stop rain which begins to cover the heated surfaces.

Category:Historical Benchmarks

Additional ResourcesEdit

  • Wikipedia Article on Earth