The World heritage

Discusses the subject matter, techniques, and cultural significance of the paintings and engravings made on rocks, both inside caves and in the open air, by primitive people around the world.

Describes several rain forests in Central America and discusses the plants, animals, and indigenous peoples that live, or have lived, there.

Discusses the habits of coral polyps, the formation of various types of coral reefs, associated plant and animal life, and the challenge of conservation.