The document provides information about early civilizations in Egypt and Mesopotamia. It begins by introducing the topic of early civilizations that will be covered in Unit 2. It then discusses some key characteristics of early civilizations in general, including their origins along major river valleys, hierarchical social structures, use of irrigation, development of urban centers, and invention of writing systems. The document goes on to provide more specific details about early civilizations in Mesopotamia and Egypt, including their social structures, religious beliefs, and some of their major empires and accomplishments in architecture, art, literature, science and other areas.