How has archeology a thing? Why is so much of our history found under the ground we reside today? Why do we have to dig down to find ancient towns? What happened?
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In green areas new dirt and dust is constantly being created that ends on top of whats there. Unless wind or some other factor clears it.
Think leaves, grass and sticks, dust and sand from the wind, bodies from insects and animals etc.
More old buildings collapse causing the top till in the foundation naturally leading to burying.
A huge amount of civilisation lives near rivers which flood leaving huge deposits of mud and silt burying everything.
Etc etc.
There are places where the opposite happens like mountain tops that get more and more exposed over time.
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