Why did the pharaohs of the ancient kingdom build pyramids? why did not the pharaohs of the early

Why did the pharaohs of the ancient kingdom build pyramids? why did not the pharaohs of the early and late kingdoms build pyramids? for what purpose were ziggurats built in the ancient interfluve? Why are the Egyptian pyramids well preserved to this day, while the ziggurats have not survived at all?

They built pyramids for themselves as tombs.

In early times, the mastaba served as a tomb. In later times, the construction of the pyramids was abandoned, as it was very expensive and required a lot of labor.

The ziggurat was a place of worship for the gods. The Egyptian pyramids were built from large stone blocks, a solid foundation helped to survive, and the ziggurats did not have such a strong foundation. Moreover, there were frequent wars, during which many churches were destroyed.