This subset explores the land masses and seas of the world. It describes mountain ranges, the oceans, continental movement, and a wide variety of features that have influenced life on earth. Detailed explorations of the evolution of dinosaurs, fish, birds, plant life and humans, as they were influenced by the earth’s surface, fill this set. Fantastic disruptions, from Mount St. helens to the ice ages are woven into the story of how the earth influences everything.