Discusses the shelves under the world's oceans at the shoreline--the creatures that live on them, their potential for providing food for man, the dangers of pollution to shelf use, and efforts to preserve their value for the future.

Explains how volcanoes erupt and the work of scientists who study volcanoes, and describes some well-known eruptions.

Examines the eating habits of several sea creatures, pointing out their interdependence on each other.

Presents information about the four groups of sea mammals, which include earless and eared whales, walruses, sea otters, sea cows, baleen whales, toothed whales, dolphins, and porpoises.