Deductive reasoning says this is quite possible.
you can only make a perfect sphere outside of earth's gravity, so the earth itself must have formed a nearly perfect sphere in its molten state.
when and how exactly the water got here is still under speculation, but the evidence that it cooled the planet exists, and the amount of water on the planet at this point, is thought to be about 2km deep if the earth was a perfect sphere. "In physics textbooks, it has only stated that Earth cooled down and so, water vapor condenses, and other life form develop and et cetera. Why did Earth cool down in the first place? What caused it to cool down?" (Question Giving true questions validation. When in fact did Earth poses this amount of water? We can only speculate as to how it got here but we can prove it exists now. As a perfect sphere the earth at the beginning was on a perfect axis, molten, solid or otherwise. If the planet cooled by water however it got here, then it would have caused a shell of cooler material completely around the planet core. Oldest fossils ever found show life on Earth began before 3.5 billion years ago (wisc.edu) This proves that life could exist at 3.5 billion years, giving the conclusion that water was here then. The Great Oxidation Event (GOE), also called Great Oxygenation Event, was a time interval when the Earth's atmosphere and the shallow ocean first experienced a rise in the amount of oxygen. This occurred approximately 2.4–2.0 Ga (billion years ago), during the Paleoproterozoic era. Earlier studies by Valley and his team, dating to 2001, have shown that liquid water oceans existed on Earth as early as 4.3 billion years ago, more than 800 million years before the fossils of the present study would have been alive, and just 250 million years after the Earth formed.
If a moon lost orbit and fell to a water planet with a rigid shell over a molten core, that shell would crack and as the weight of this moon tore itself apart the cracks would form around different parts or "Continents" as they would soon be, slowly working themselves apart.
The most widely accepted origin explanation posits that the Moon formed about 4.51 billion years ago, not long after Earth, out of the debris from a giant impact between the planet and a hypothesized Mars-sized body called Theia. It then receded to a wider orbit because of tidal interaction with the Earth. The near side of the Moon is marked by dark volcanic maria ("seas"), which fill the spaces between bright ancient crustal highlands and prominent impact craters. Most of the large impact basins and mare surfaces were in place by the end of the Imbrian period, some three billion years ago.
2 Ancient Texts Speak Of A Time ‘Before The Moon’ Many ancient writings speak of a time “before the Moon.” In turn, many scholars have quoted these works over the centuries. For example, Aristotle wrote of Arcadia, stating that the land was occupied “before there was a moon in the sky above the Earth.”
It all started some 4.5 billion years ago when, as theory has it, our nascent Earth was blindsided by a Mars-size planetary embryo, believed to have spun Earth into its initial fast rotation of roughly 12 hours per day. The molten mantle thrown into orbit after the catastrophic lunar-forming impact quickly coalesced into our moon. Within a few thousand years, Earth cooled to an object with a molten surface and a steam atmosphere. Life emerged some 700 million years later, or about 3.8 billion years ago.
can't have it both ways, can you?
unless the original moon fell and and a new moon put in place.