Discovering Northwest Volcanoes Author:Nancy Field and Sally Machlis This is a learning and activity book for elementary children. It explains the parts of the earth and their interaction with each other to produce volcanoes. It covers the different types of volcanoes and includes a game and activities to enhance understanding of the concepts. A map is included of the volcanoes from Washington to Northern Cal... more »ifornia with a brief description of most explaining what happened to create them.« less