Facts about

Describes different methods of getting energy from wind or water, including windmills, water wheels, dams, and the harnessing of river power.

Discusses how the human body acquires and uses energy based on the types of food consumed.

Examines the five known planets that lie outside the orbit of Mars, discussing their history, composition, moons, and possible planetary neighbors beyond Pluto.

Examines the four planets that lie closest to the sun, discussing their composition, movements, and moons.

Text and pictures introduce basic information about birds, their habits, and their behavior.

Discusses the types of forests, the trees that constitute them, the clearing and planting of forests, and their interaction with both humans and wildlife.

Traces the evolution of reptiles from various prehistoric animals, including flying and sea dinosaurs. Discusses the death of dinosaurs, where reptiles live today, the variety of lizards, snakes, crocodiles, alligators, and turtles, their enemies, and their future.

Introduces various types of insects, describing their skin, wings, eyes, feelers, life cycles, and environments; how they breathe and eat; and those that are pests and those that are helpful.

Text and illustrations introduce sea animals from the simplest types such as corals and sponges to the more highly developed fish and sharks.

Explains how mountains and volcanoes are formed, which animals live in mountains, and life and travel in the mountains.