Describes various scientific theories which explore the extinction of the dinosaurs.

Read and find out about one of nature's most mysterious forces-the earthquake. Some earthquakes are so small that you don't even feel them, while others can make even big buildings shake! Learn why earthquakes happen, where they are most likely to occur, and what to do if one happens near you.

Brief text and illustrations describe the various parts of the foot and all the things feet help us to do.

Explains how water flows from brooks, to streams, to rivers, over waterfalls, through canyons and dams, to eventually reach theocean.

Describes the life cycle of an apple from its initial appearance as a spring bud to that point in time when it becomes a fully ripe fruit.

Describes the parts of the eye and how they work.

Briefly describes how a cow produces milk, how the milk is processed in a dairy, and how various other dairy products are made from milk.

Discusses the importance of trees as sources of food, oxygen, and other essential things.

Describes the metamorphosis from tadpole to frog.