Simple text and illustrations describe the differences between alligators and crocodiles.

Simple text and photographs introduce the sense of smell. On oversize pages.

Discusses the need to conserve the rain forests because of their wealth of plant and animal life, effect on weather, and importance to people throughout the world.

Gives a simple explanation of the four main directions and tells how to use the sun to determine direction.

Describes the development of a seed into a plant by means of pollination, fertilization, and seed dispersal.

Explains how the Dewey decimal system of classification for libraries was invented and how it works.

Explains how rainbows are formed by the colors in sunlight shining through water.

Provides information about oysters, clams, scallops, and mussels--sea animals that live in shells.

Presents such signs of summer as heat, playtime, thunderstorms, growing, and fun.

Introduces the world's longest river, describing its origin, tributaries, animal life, and the different countries through which it flows.