<human>:  Why were the pyramids of Pharaonic Egypt built?
<bot>: The pyramids of Egypt were built as tombs for the pharaohs. The pyramids were made of limestone, which was quarried from the Giza plateau. The limestone was then cut into blocks, and then moved by a team of slaves to the construction site. The limestone was then assembled into a pyramid shape, and then covered with a layer of smooth white limestone.