"The Good Question! series continues to offer interesting facts in an appealing fashion. Working within a set format, the skilled authors organize questions and two- or three-paragraph answers in ways that introduce and cover each subject appropriately. On each spread, clearly captioned illustrations -- maps, drawings, close-up photographs, and realistic images -- face the text. The questions are those a child reader might ask. . . . "Why is the Sea Salty?" explains the composition and motion of bodies of water, introducing some inhabitants and scientific studies of this "final frontier" and touching on the problem of rising water levels. Attractively presented, with up-to-date, accurate information, these science titles are a first choice."