This document is a review sheet for a unit test on early civilizations. It contains 22 terms for students to define related to Mesopotamia, Egypt, India, and China. It also provides 8 questions for students to answer in essay format about the origins of humanity, similarities between river valley civilizations, the importance of the Neolithic Revolution, geography's role in isolating China, characteristics of civilization, the role of pharaohs, India's caste system, and differences between primary and secondary sources. The review sheet is intended to help students study for the upcoming test and identify content they need to review.