Where Did The (Great Flood) Water Come From And Where Did It Go?

Your insulting word up in the front destroys ALL you said after that. So if you can't help to use it, please put it at the end. So I would at least read through what you said.

With that scope of view, the whole universe may not be a closed system. But for short-sighted geologist, the earth IS a closed system.

Yeah. It is quite interesting to see that both Mars and Venus lost their water, but the earth is gaining more and more water in the history.

Good question. It could be a thesis for a master degree geology student.That means, it is a workable problem. We can model the annual budget of water on the earth and find it out. The earth has way passed its peak dewatering stage. But the new (cognate) water is still continuously coming up to the surface through volcanic activity.The key problem is: we may not see all the water generated just by measuring how much water shows up. A lot of water are generated in the mantle but temporary stay and accumulated in there.

Sorry, the term may mislead. A closed earth IS a working background for most geological researches, even we do know the earth is not really a closed system.