An entertaining grand tour of seven natural wonders of the world, for young scientists ages 9-12. Popular weather forecaster Spencer Christian explains the scientific principles behind the famous Grand Canyon, Mount Everest, Victoria Falls, Carlsbad Caverns, Giant Redwoods, Paricutin Volcano and the Nile River. With maps, illustrations and hands-on activities. Parents, get ready to be peppered with fascinating facts.  (SWU05, $12.95)