Nature in action

Describes how caves form and what kinds of life can be found in them, and shows how the delicate underground environment must be protected.

Text and photographs discuss the origins, characteristics, and lore of the northern lights known as auroras.

Discusses how the Grand Canyon was and is still being formed, the three kinds of rock formations, the power of erosion, and how its beauty and variety are threatened and what is being done to save it.

Covers a variety of facts on lightning, including how it is formed, the different types of lightning, what thunder is and its relationship to lightning, and much more.