9781422274545

CONTENTS

30

6

Marine Energy .

W ords to U nderstand .

34

8

Hydropower.

I ntroduction .

38

10

Hydrogen Energy.

Future Energy Needs.

40

12

Biofuels.

Solar Energy.

42

14

Types of Biofuels.

Solar-powered Objects .

Passive Solar Energy. 16 Solar Heating in Homes. . . . . . . . 18 Solar Energy in Space . 20 Wind Energy. 22 Wind Farms . 24 Geothermal Energy . 26 Geothermal Energy in the Future . 28

44

T ext -D ependent Q uestions .

45

R esearch P rojects .

46

F ind O ut M ore .

47

S eries G lossary of K ey T erms .

48

I ndex .

KEY ICONS TO LOOK FOR

Words to Understand: These words with their easy-to-understand definitions will increase the reader’s understanding of the text, while building vocabulary skills.

Sidebars: This boxed material within the main text allows readers to build knowledge, gain insights, explore possibilities, and broaden their perspectives by weaving together additional information to provide realistic and holistic perspectives. Educational Videos: Readers can view videos by scanning our QR codes, providing themwith additional educational content to supplement the text. Examples include news coverage, moments in history, speeches, iconic moments, and much more!

Text-Dependent Questions: These questions send the reader back to the text for more careful attention to the evidence presented here.

Research Projects: Readers are pointed toward areas of further inquiry connected to each chapter. Suggestions are provided for projects that encourage deeper research and analysis.

Series Glossary of Key Terms: This back-of-the-book glossary contains terminology used through- out this series. Words found here increase the reader’s ability to read and comprehend higher-level books and articles in this field.