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Nature of Science:Protecting Desert Wildlife 14

Chapter 1 Populations and Communities 18

1 Living Things and the Environment 20

2 Integrating Mathematics:Studying Populations 27

3 Interactions Among Living Things 35

Chapter 2 Ecosystems and Biomes 46

1 Energy Flow in Ecosystems 48

2 Integrating Chemistry:Cycles of Matter 55

3 Biogeography 60

4 Earth's Biomes 66

5 Succession 80

Chapter 3 Living Resources 86

1 Environmental Issues 88

2 Forests and Fisheries 95

3 Biodiversity 101

4 Integrating Health:The Search for New Medicines 110

Chapter 4 Land and Soil Resources 116

1 Conserving Land and Soil 118

2 Solid Waste 125

3 Integrating Chemistry:Hazardous Wastes 134

Chapter 5 Air and Water Resources 142

1 Air Pollution 144

2 The Water Supply 153

3 Integrating Technology:Finding Pollution Solutions 159

Chapter 6 Energy Resources 166

1 Fossil Fuels 168

2 Renewable Sources of Energy 175

3 Integrating Chemistry:NuclearEnergy 185

4 Energy Conservation 191

InterdisciPlinary Exploration:African Rain Forests 198

Reference Section 204

Skills Handbook 204

ThinkLike a Scientist 204

Making Measurements 206

Conducting a Scientific Investigation 208

Thinking Critically 210

Organizing Information 212

Creating Data Tables and Graphs 214

Appendix A:Laboratory Safety 217

Glossary 220

Index 224

Acknowledgments 228

Inquiry Activities 19

CHAPTER PROJECT 19

Opportunities for long-term inquiry 19

Chapter 1：What's a Crowd? 19

Chapter 2：Breaking It Down 47

Chapter 3：Variety Show 87

Chapter 4：What's in a Package? 117

Chapter 5：Pollution vs.Purity 143

Chapter6：Energy Audit 167

DISCOVER 20

Exploration and inquiry before reading 20

What's in the Scene? 20

What's the Population of Beans in a Jar? 27

How Well Can You Hide a Butterfly? 35

Where Did Your Dinner Come From? 48

Are You Part of a Cycle? 55

How Can You Move a Seed? 60

How Much Rain Is That? 66

What Happened Here? 80

How Do You Decide? 88

What Happened to the Tuna? 95

How Much Variety Is There? 101

How Are Plant Chemicals Separated? 110

How Does Mining Affect the Land? 118

What's in the Trash? 125

What's Hazardous? 134

How Does the Scent Spread? 144

How Does the Water Change? 153

Can You Remove the Tea? 159

What's in a Piece ofCoal? 168

Can You Capture Solar Energy? 175

Why Do They Fall? 185

Which Bulb Is More Efficient? 191

Sharpen your Skills 28

Practice of specific science inquiry skills 28

Calculating 28

Classifying 41

Observing 50

Developing Hypotheses 56

Inferring 71

Interpreting Data 73

Communicating 93

Calculating 98

Graphing 127

Communicating 148

Graphing 160

Graphing 170

Calculating 187

TRY Tilrs 22

Reinforcement of key concepts 22

With or Without Salt? 22

Elbow Room 31

Weaving a Food Web 53

Desert Survival 69

It's in the Numbers 129

How Acid Is Your Rain? 147

Getting Clean 154

Shoot the Nucleus 186

Skills Lab 26

In-depth practice of inquiry skills 26

A World in a Jar 26

Change in a Tiny Community 78

Tree Cookie Tales 100

Save That Soil 124

Concentrate on This! 158

Keeping Comfortable 190

Real-World Lab 33

Everyday application of science concepts 33

Counting Turtles 33

Biomes in Miniature 64

Is Paper a Renewable Resource? 94

Waste,Away! 132

How Does the Garden Grow? 152

Cooking With Sunshine 183

EXPLORING 38

Visual exploration of concepts 38

Defense Strategies 38

A Food Web 52

Endangered Species 106

Soil Conservation 121

A Landfill 126

Climate Predictions 151

A Solar House 177

Interdisciplinary Activities 149

Math Toolbox 149

Concentration 149

Science and History 90

Making a Difference 90

Energy-Efficient Devices 192

Science and Society 34

Animal Overpopulation：How Can People Help? 34

Hydroelectric Dams：Are They All Here to Stay? 184

Connection 24

Language Arts 24

Social Studies 62

Social Studies 96

Social Studies 137

Language Arts 145

Social Studies 179