The picture you are referring to is the one from Ancient Egypt, I believe. The barge appears to be transporting t<span>wo obelisks and it can be assumed that they will be used for a temple.</span>
Answer:
From my experience, it is more difficult to slide a crate on a shag carpet because of the material the carpet is made out of. When it is a tile floor it will just slide with ease.
Explanation:
Scribes were extremely important in Sumerian society since they were needed to transcribe everything that was written, because this was before the time of the printing press (which made duplication of such documents are easier).
You can check other sources as well
I would say trading cities became more important
