Eli5: They recently uncovered an ancient city wall near to where I live. How does an ancient structure like a wall get covered by layers of ground?
In: 2
1. The weight of the wall might make it sink over hundreds of years
2. Earth moves and might pile up around a wall
3. The wall can get knocked down (either by people or nature), which makes the other stuff a lot easier
4. Someone might build something on top of the wall, piling up a foundation around it.
4. Probably other factors as well
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