The underwater world fascinates adults. There is no doubt it would fascinate children. They would be introduced to life that is not found on the surface world. They can learn the names of new animals, like fish, crustaceans and undersea mammals. They may become curious about the plants that they see in the coloring book, like kelp and coral. Opening up a new world to them that they can engage in through coloring and other activities will help keep them occupied.