This student text is designed for grades 2-4 and explores various earth science topics. A cartoon character named Tommy Tsumi explains earth facts and concepts throughout the text. Activities, materials, and learning objectives for each unit in the textbook are provided in the teacher's guide. Units in both include: (1) "What Does Our Earth Look Like?"; (2) "I Invite You to Know the Inside of the Earth"; (3) "Earthquakes and Tsunamis"; (4) "What is a Natural Hazard?"; and (5) "Basic Prevention Rules in Case of Natural Hazards". (WRM)