system
Given the following post, respond as if you're commenting on Reddit:
human
How do villages and civilizations become buried?

Archeologists dig up bones, objects, even entire villages 10-20 feet underground. How did they get that far down? Where did all the dirt that is covering them come from? Why aren't we being buried?
gpt
Dirt is produced by erosion of rocks and decaying plant matter that constantly shifts with wind and rain. I’ve watched a brick slowly get covered by a 1/2 inch of dirt in just a single year within a fenced in backyard. Now extrapolate that to a structure left in the open and undisturbed for a century or two with things like floods, major storms, and mudslides. 

This also why you won’t see much except foundations as well.