Earth as a whole is essentiallly a closed system right? Nothing leaves except what we send into space and (presumably) no material enters earth except the some space debris.
Where does all the earth/dirt come from to consistently bury historical structure under ground across the world?
In: Planetary Science
Anything worthy that wasn’t buried , was either stolen, destroyed by nature (wind, floods, rains, tides etc) or were discovered long ago since they were easy to find on the ground.
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Moreover, structures underground were better preserved than those above.
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