Roma Gans

Describes the formation and characteristics of igneous, metamorphic, and sedimentary rocks and how to recognize and collect them.

Explores the mysteries of bird migration, including theories on how birds find their way and how scientists learn about migration.

Explains how icebergs are formed from glaciers, move into the ocean, create hazards to ships, and sometimes melt away.

Describes how and why animals shed their feathers, hair, shells, horns etc., with emphasis on the molting of birds.

Describes eyes, feet, and feathers in their roles as protective features for sleeping birds.

Briefly discusses how oil is formed, how it is recovered from the ground, and its many uses.

Describes the water cycle, discusses water pollution, and examines what is being done toprotect our essential water supply

Describes the general migratory and feeding habits of the hummingbird emphasizing the amount of fuel necessary to sustain the small high-powered body weighing less than a penny.

Describes the various methods of nest-building used by many different birds.

Explains how icebergs are formed from glaciers, move into the ocean, create hazards to ships, and sometimes melt away.

Explains, in simple language, the formation of stones and the "wonder" of discovering them in their varying sizes, shapes, and compositions.

Discusses the feeding habits of birds.

Easy-to-read text explains the meaning of bird sounds.

Text and pictures present the formation, types, inhabitants of, and exploration of caves.