Contains entries that provide overviews of twelve of Earth's major biomes, providing information about the formation, climate, elevation, growing season, plants, animals and endangered species, food webs, human culture, and economy of each ecological community.

Vol. 1. Coniferous forest, continental margin, deciduous forest, and desert -- v. 2. Grassland, lake and pond, ocean, and rain forest -- v. 3. River and stream, seashore, tundra, and wetland.