At https://phys.org/news/2026-02-earth-core-oceans-worth-hydrogen.html … Earth’s core is iron. That is a long standing theory. A thoroughly consensus opinion. However, it seems the iron core is not as dense as sit should be. It is not dense enough to be mostly made of purre iron. Lighter elements must therefore exist within the core. It is suspected, after some clever footwork, there is a major reservoir of hydrogen within the core. The major component of H2O = water. Such an idea challenges the theory that water was delivered to Earth by way of comets and space rocks.
How reached that conclusion is described at the link above. The new theory is that Earth aquired water during the early accretion phase of planetary history. We are not told how the hydrogen, and the oxygen, came from the innards of the Earth in order to create the world’s ocean. We may also not this idea would fit like a glove the idea of an expanding Earth – rather than one of Plate Tectonics. Major catastrophic events may have created the chaos necessary for water to erupt out of the ground. At locations such as the Mid Atlantic Ridge, as an example. The hydrogen, of course, would first have to vacate the core and mix with oxygen in the Mantle – or perhaps a little more thinking is required. We might even ask – does such a discovery make Pangaea redundant?