I don't know about you but when I was a kid in primary school, I learned about something called the water cycle. And I learned that the reason it's called a cycle is that when water evaporates, it's not a one way trip. It actually returns to the land and the oceans as rain, snow, hail, sleet. You know, precipitation. The point being it doesn't just stay up in the atmosphere forever.
NASA offers a site for children that explains this in some detail:
https://gpm.nasa.gov/education/water-cycle