Exuding her usual air of competence, Ms. Frizzle drives the magic school bus to the beach, over the sand, and into the waves to take her wisecracking class on a tour of an intertidal zone, the continental shelf, the deep sea bottom, and a coral reef. Degen's paintings feature plenty of colorful (and unobtrusively labeled) sea life. As always, the pace is breathless, the facts well chosen, the excitement of scientific study neatly evoked, and Ms. Frizzle's wardrobe equal to every extraordinary occasion. At the end, her students assemble a bulletin board chart to summarize their observations and--apparently in response to adult anxieties--Cole closes with a quiz clarifying the difference between fact and fiction in the story. Yes, it's a formula, but a winning one.