What formed the oceans on Earth?

The formation of oceans on Earth is primarily attributed to the process of water vapor condensing as the planet cooled. When the Earth was in its early stages, it was incredibly hot due to volcanic activity and the impact of celestial bodies. As the planet began to cool, the water vapor in the atmosphere started to condense into liquid form, which eventually collected in low-lying areas, creating oceans.

This process is crucial in understanding the Earth's early environment and the development of its hydrosphere. Other options, while they mention factors that could contribute to water on Earth, do not explain the main mechanism behind the formation of oceans as clearly as the condensation of water vapor. Melting ice from glaciers refers to a process that occurred much later in Earth's history, while meteoric showers could have contributed small amounts of water but were not the primary source for ocean formation. Flooding from other planets is not a scientifically supported process concerning how Earth’s oceans developed.