Science matters

Explores the characteristics of oceans, lakes, and rivers. Describes the water cycle and how people use the water. Includes numerous color photos and illustrations, questions, and an experiment.

Provides basic information on the history of space exploration from the earliest telescopes to the robots that collect data on Mars.

Contains visual diagrams, hands-on experiments, and biographies associated with the study of air pollution; and describes the various toxic chemicals and gases that pollute the air such as acid rain and smog, what causes pollution, the Air Quality Index, and the effects of global warming.

Presents an introduction to the rock cycle, the process by which rocks form, break down, and reform over the course of thousands of years, looks at different types of rocks, and examines the forces that cause rocks to change.

Presents information on earthquakes, in simple text with illustrations, and discusses how they happen, what their devastating effects can be, where the danger zones are, and how they can be predicted.

Introduces young readers to wedges, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Introduces young readers to levers, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Introduces young readers to inclined planes, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Introduces young readers to screws, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Introduces young readers to pulleys, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.