The handsome black and white photographs are the best evidence for the choice of the word ""wonders."" Most of the thirteen phenomena included here are geologic (the Sahara desert, the Giants' Causeway off the Irish Coast, Mount Everest, The Carlsbad Caverns, etc.) but others include the Great Sequoias, the Sargasso Sea, and so on. The brief text emphasizes physical details with vital statistics included for gee-whiz effects, and occasional anecdotes. Explanations of the natural processes that were the cause of these unusual structures are understated. The Grand Canyon, so fully treated many times before, is the best summarized; the once fertile land of the Sahara Desert is accounted for only by ""gradually, the water disappeared, the earth hardened and dried, and soil and sand were blown about over the surface;"" and in most other cases the scientific material is too abbreviated to be satisfactory. More for armchair explorers than for information.