How did the earth an the sky get separated?

In various mythologies, the separation of Earth and Sky often symbolizes the emergence of order from chaos. In Greek mythology, for example, Gaia (Earth) and Uranus (Sky) were initially united until their offspring, the Titans, led to Uranus's castration by Cronus, allowing the Earth and Sky to exist as distinct entities. Scientifically, this separation can be seen as part of the planet's formation process, where gravitational forces shaped the Earth's crust and atmosphere over billions of years, creating a distinct boundary between the two.