This document discusses the characteristics of early civilizations and provides details about the Sumerian civilization that emerged in Mesopotamia around 3000 BCE. It notes that civilizations have advanced cities, complex institutions, specialized workers, record keeping, and advanced technology. The Sumerian civilization in Ur exhibited these traits and was notable for developing the first irrigation systems, libraries, written contracts, laws, and literature like the Epic of Gilgamesh. Life in Ur revolved around agriculture, trade, and a polytheistic religion centered on temples called ziggurats.