7. How did the Earth’s oceans emerge, and what is their importance?

In the first stage, the atmosphere was formed by volcanic emanations, such as water vapor, carbon dioxide, sulfur dioxide, and nitrogen. At that time, oxygen was barely present. In the second stage, as the Earth slowly cooled, the water vapor condensed, thus forming the oceans.

The first species emerged in the oceans, which, after millions of years, began an exodus to land, eventually evolving into a wide diversity of terrestrial fauna.