To celebrate its 20th anniversary, Scholastic is re-releasing the ten original Magic School Bus titles in paperback. With updated scientific information, the bestselling science series ever is back! When Ms. Frizzle drives the Magic School Bus full speed ahead into the ocean, the class takes a submarine expedition that's anything but ordinary. With a well-meaning lifeguard in tow, the class takes a deep breath and learns about hot water vents, coral reefs, plant and animal life on the ocean floor, and more!