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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Aside from the redistribution of dust mentioned by others …
Charles Darwin once spent some time measuring worm casts, and concluded that topsoil gets turned over pretty quickly. (I think he reported this in a standalone paper, not part of one of his books.) As it’s churning, solid stuff on the surface eventually is not on the surface.
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