Young armchair adventurers will get a pleasant introduction to a few of America's national parks in these installments in the Rookie National Parks series (4 new titles). Each slim volume focuses on the variety of climates or geography within a park, its wildlife and native plants, and unusual features; a map-based problem and an identification quiz wrap things up, along with a brief visual glossary. A cartoon fox, Ranger Red Fox, provides context for the photos, and inset boxes offer additional facts. Volcanoes are central to the information in Mount Rainier, and this title emphasizes what effect volcanic activity has had on the landscape, such as rock columns and ice caves. The eye-catching full-color photos and inviting, brief sentences give this easy, accessible appeal for beginning readers, and the broad scope of information, though not comprehensive, should lead young readers down interesting paths, perhaps literally.