Planet Earth

Photographs, text, and essays describe gemstones, their creation, harvest by man, and their current status in the marketplace.

Photographs and text describe the unique characteristics of animals, large or small and from various habitats, to illustrate their importance to the world's ecology.

Discusses major storms such as whirlwinds, hurricanes, thunderstorms and tropical storms and includes essays on some notable storms of the past.

Presents illustrated accounts of some relatively recent major earthquakes and discusses the developments in seismology that have made earthquakes predictable.

Describes grasslands and tundra, and includes five essays on the topics.

Discusses the behavior of ocean and tidal currents, research done in the field and large scale sea-air interaction.

Discusses the features and origin of volcanoes, various kinds of eruptions and their causes, different types of lava, and some well-known volcanoes.

Introduces the world of geology by explaining why natural disasters and wonders happen.

Contains photographs, text, and five essays about rivers and lakes.

Explores glacial action and theories about the earth's Ice Ages. Presents some of the relics of the Ice Age that have been found, including ancient art and frozen animal remains.