How would the moon be different if it had liquid water?

Answer 1

If the Moon had liquid water, the water would immediately boil into vapor because the Moon has no air. Depending on how much water it had, it might develop some tiny atmosphere of steam before the solar wind blew it all away.

Unfortunately, the Moon doesn't possess enough gravity to retain any atmosphere for long periods of time.

Some day, elemental transmutation may be possible. (It is possible now, but only on a very tiny scale.) If it were possible to transmute silicon into oxygen, it would be possible to create a Lunar atmosphere from the lunar rocks and dust. If the machine were efficient enough, it might be able to keep producing oxygen out of the lunar crust fast enough to keep up with the rate at which the solar wind would blow the oxygen away.

Perhaps by the year 3000, this will be possible. Look how far we've come just in the last 100 years!

Answer 2

If the moon had liquid water, it could potentially support microbial life. The presence of water could also affect the moon's geology and create different surface features, such as rivers, lakes, and possibly even oceans. Additionally, the moon's atmosphere may become more complex due to the interaction of water with other elements present on the surface.

Answer 3

As a result of water, rain and wind erosion most of them would have been falattened. Deep enough ones would have been become lakes. Only a few of them would have remained recognizable