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I'm going to throw a little bit of a curveball at ya. Most of the damage to the pyramids in Giza isn't from erosion. They were originally covered in white limestone and the tops were capped in hammered gold. An earthquake sometime in the early 1300s began dislodging the limestone and from about 1600 to about 1800 a quarry was established in Giza and the gold and limestone were removed.