Gr 7-9–These choppy and incomplete books attempt to cover too much and lack diagrams of how geological processes work. Some of the topics addressed in Canyons, for example, include the geological history of the Grand Canyon, how canyons are formed and studied, plate tectonics, the effects of tourism and other environmental hazards, related careers, and the future of canyons. Despite the series subtitle, the book includes a discussion of relevant landforms on Mars, but does not mention those under Earth’s oceans. In addition, some of the material in Glaciers is highly relevant to canyon creation, but is not included in the book on those formations. The best use of these books will be as jumping-off points for more serious research. They contain many examples that may pique students’ interest; have solid, current bibliographies; and their further-reading lists include exciting popular science materials such as (in Mountains) Simon Winchester’s Krakatoa.