THE CHANGING EARTH, a leader in the Introductory Geology course, is the only text specifically written for the combined physical and historical geology course. The Fourth Edition's content is based on the best-selling texts PHYSICAL GEOLOGY: EXPLORING THE EARTH and HISTORICAL GEOLOGY: EVOLUTION OF EARTH AND LIFE THROUGH TIME, both written by James Monroe and Reed Wicander. Briefer than the previous edition and maintaining a consistent and clear writing style throughout, the text provides a balanced coverage of physical and historical geology with engaging, real-life examples that draw students into the material. Examples in the Fourth Edition include new two-page art spreads, new paleogeographic maps, and "Geology in Unexpected Places"-a favorite feature from PHYSICAL GEOLOGY: EXPLORING THE EARTH, Fifth Edition. Known for its competitive and robust ancillary package, the Fourth Edition now features GeologyNow, the first assessment-centered student tutorial technology developed for the Geology market. The seamless integration of GeologyNow with chapter concepts emphasizes the connections between the content and students' own lives, through visual 3-D animations and chapter quizzes, helping students develop a greater appreciation for geology.