The beach in front of tree house

[Kritter]

But out of curiosity, should something really be called "erosion" if it can come back?

Can things "un-erode"? Or would that be like something "un-rusting" once that something has become rusted and ruined? (grin)

If it can "un-erode", did it actually "erode" in the first place? Or just get misplaced and put back?

More food for thought...

Well, erosion isn't quite the same as 'rusting' since erosion does not involve a chemical reaction. In a sense, yes, the beach can 'un-erode', although it's usually referred to as deposition or accretion. Happens all the time in a dynamic system like this.