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