Which long-standing theory regarding Earth's water origin is strongly supported by the existence of this vast internal reservoir?

Answer

A significant source came from outgassing from within the planet itself

The discovery of this large internal reservoir lends considerable support to the theory that a significant, perhaps primary, source of Earth's water originated from outgassing processes within the planet during its formation and subsequent history.

Which long-standing theory regarding Earth's water origin is strongly supported by the existence of this vast internal reservoir?
GeologyoceanEarthwaterplanet