Why do archeological sites always get deeper underground with time? If ground gets on top of them, it must have came from somewhere else. Why no locations seem to rise with time, rather than sink?
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It depends on the area, but most dirt comes from plant decay. When a plant dies it is consumed by bacteria and fungus. What’s leftover are component of dirt. Even simple grasses on plains decay and add a bit of dirt. Over hundred or thousands of years of decay the little layers stack up.
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