Explains how bacteria and viruses affect the human body and how the body fights them.

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.

Explains why oil spills occur and how they are cleaned up and suggests strategies for preventing them in the future.

Describes how earth is like a space shuttle, yet able to renew its resources.

Describes the formation and characteristics of igneous, metamorphic, and sedimentary rocks and how to recognize and collect them.

Discusses the properties of light, particularly its source in heat.

In simple text, presents the three states of matter, solid, liquid, and gas, and describes their attributes.

A brief study of the first creatures on earth to develop voices and an aversion to dry skin.