The Earth could have been called Planet Ocean. In fact, oceans are our planet’s largest life support system. About 70% of the planet’s surface is covered by water, and 97% of this water is found in the oceans.

It is interesting quotation from article from Forbes – feel invited for reading more:
https://www.forbes.com/sites/esade/2021/04/15/planet-ocean-why-is-the-blue-economy-so-important/