This is a fantastic new edition of this bright and lively encyclopedia, introducing young readers to the wonders of the sea. Filled with information on waves, currents, marine life and ocean exploration, this book answers such questions as 'How deep is the ocean?' 'Which fish can blow itself up like a balloon?' and 'How do dolphins use sound to hunt?' Simple text, amazing photographs, detailed illustrations and a selection of exciting recommended websites make the subject easy to understand.