Primitive oceans refer to the early bodies of water that formed on Earth over 4 billion years ago. These oceans were likely shallow and rich in minerals, created as the planet cooled and water vapor condensed. They played a crucial role in shaping the planet's geology and atmosphere. The composition of primitive oceans was different from today’s oceans, containing high levels of dissolved minerals and gases. This environment may have been essential for the emergence of early life forms, such as simple microorganisms, which eventually led to the evolution of more complex organisms over millions of years.