Earth Then and Now Author:Carla W. Montgomery, David Dathe, James H. Zumbege, Robert H. Rutford, James L. Carter This edition has been updated and revised to incorporate equal coverage of both physical and historical geology. It features: expanded discussion of dinosaurs in a chapter entitled "Mesozoic Life"; a new chapter, "The Proterozoic", which contains a thorough discussion of the origin of life; revised discussion of the solar system has been combine... more »d with "The Archean" to provide fundamental background information on the origin of the planet; and coverage of volcanic activity, earthquakes, coastal erosion and hazards, flooding, water supply, and landslides and human activities.« less