Does everything sink then some dust covers it up and the rebuilding happens again? Thanks.
Inquiring minds.
Regards.
There are reasons a site for a structure is originally chosen, water, height, defendable and etc. People keep building things on the same site and previous 'stuff'is covered. Sites that are abandoned can become covered by wind blown sand, dirt and dust.
"Does everything sink then some dust covers it up and the rebuilding happens again? Thanks."
Yup, those old civilizations were lousy housekeepers!
Tels (hills) are actually hundreds and thousands of years of building on top of the previous structure, oft time, mud bricks which eventually 'melt' forming hills.
This problem was once analyzed by a philosopher named Lodermulch. The theory is that for every square foot of ground, approximately one and one quarter of a million men have died and laid down their dust, thus creating an increasingly thick layer of ancestral sediment, up to 1/2 mile thick in some areas, upon which it is sacrilegious to walk. See "Eyes of the Overworld" pp 121-122 for a deeper analysis and religious implications of this phenomenon.