Answers: The what of the moons? Love to help, but I don't read between the lines what you want to know.
Changes over what period of time? Over former times year, the only change in earth's moon would be the occassional meteorite collision. But billions of years ago, giant meteor/asteroid collisions excavated huge basin, cracked the crust, and allowed lava to ooze out , filling the basin with the "lunar seas" that we see today. (the lava froze solid, unsurprisingly, a long time ago.)
The other change is that humans own landed on the moon! In reality, Apollo 11 landed on one of those sea of frozen lava.
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