Our changing environment series

Brief text, accompanied by color photographs, discusses various aspects of the earth's geology, including rocks and minerals, soil formation, springs, wells, geysers, and caves.

Describes, with the aid of color photographs, the varieties of plant and animal life found in or near the sea.

Brief text and color photographs introduce some of nature's phenomena such as volcanoes, glaciers, wind and water erosion, rainbows, and fog.

Describes some of the animals of North America, their habitats, their interrelationships with other animals and plants in their environment, and man's role in destroying or maintaining the ecological balance.

Brief text and color photographs describe the climates, vegetation, and animal life of different kinds of forests, deserts, and polar regions.