Earth's Waters 14
Nature of Science:Life In a Sunless World 14
Chapter 1 Earth:The Water Planet 18
1 How Is Water Important? 20
2 Integrating Chemistry:The Properties of Water 27
3 The Water Cycle 36
Chapter 2 Fresh Water 44
1 Streams and Rivers 46
2 Ponds and Lakes 57
3 Integrating Life Science:Wetland Environments 63
4 Glaciers and Icebergs 69
5 Water Underground 72
Chapter 3 Freshwater Resources 82
1 Water to Drink 84
2 Balancing Water Needs 94
3 Freshwater Pollution 101
4 Integrating Physics:Water As an Energy Resource 109
Chapter 4 Ocean Motions 116
1 Wave Action 118
2 Integrating Space Science:Tides 126
3 Ocean Water Chemistry 131
4 Currents and Climate 138
Chapter 5 Ocean Zones 148
1 Exploring the Ocean 150
2 Integrating Life Science:Life at the Ocean's Edge 160
3 Integrating Life Science:The Neritic Zone and Open Ocean 166
4 Resources From the Ocean 173
Interdisciplinary Exploration:The Mississippi 184
Reference Section 190
Skills Handbook 190
Think Like a Scientist 190
Making Measurements 192
Conducting a Scientific Investigation 194
Thinking Critically 196
Organizing Information 198
Creating Data Tables and Graphs 200
Appendix A:Laboratory Safety 203
Glossary 206
Index 209
Acknowledgments 212
Inquiry Activities 19
CHAPTER PORJECT 19
Opportunities for long-term inquiry 19
Chapter 1:Every Drop Counts 19
Chapter 2:Build a Watershed 45
Chapter 3:A Precious Resource 83
Chapter 4:Protecting a Shoreline 117
Chapter 5:At Home in the Sea 149
DISCOVER 20
Exploration and inquiry before reading 20
Water,Water Everywhere? 20
What Are Some Properties of Water? 27
Where Does the Water Come From? 36
What Affects How Water Moves? 46
What's in Pond Water? 57
Wet or Dry? 63
How Can Ice Change the Land? 69
Where Does the Water Go? 72
How Hard Is It to Move Water? 84
Can You Reach a Balance? 94
Will the Pollution Reach Your Wells? 101
Can Water Do Work? 109
How Do Waves Change a Beach? 118
When Is High Tide? 126
Will the Eggs Sink or Float? 131
Which Is More Dense? 138
What Can You Learn Without Seeing? 150
Can Your Animal Hold On? 160
How Deep Can You See? 166
Is It From the Ocean? 173
Sharpen your Skills 24
Practice of specific science inquiry skills 24
Calculating 24
Inferring 54
Drawing Conclusions 73
Predicting 97
Classifying 103
Graphing 128
Drawing Conclusions 140
Interpreting Data 156
Inferring 170
Observing 176
TRY Tuis 29
Reinforcement of key concepts 29
Follow That String 29
Comparing Solvents 30
Tabletop Water Cycle 38
The Knuckle Divide 49
A Natural Filter 65
An Artesian Well 76
Moving Water Uphill 90
How Do Your Algae Grow? 106
Making a Water Wheel 110
Wave Motion 120
Seaweed Candy 175
Skills Lab 34
In-depth practice of inquiry skills 34
Speeding Up Evaporation 34
How Fast Does a Stream Flow? 50
Getting the Salt Out 99
Investigating Changes in Density 136
The Shape of the Ocean Floor 159
Real-World Lab 40
Everyday application of science concepts 40
Water From Trees 40
Soil Testing 74
Testing the Waters 86
Modeling Ocean Currents 142
Cleaning Up an Oil Spill 180
EXPLORING 37
Visual exploration of concepts 37
The Water Cycle 37
A River 52
A Pond 58
Drinking-Water Treatment 89
Wastewater Treatment 92
A Hydroelectric Power Plant 111
The Water Column 134
The Ocean Floor 154
Interdisciplinary Activities 88
Math Toolbox 88
Parts per 88
Calculating Density 133
Science and History 22
Water and Agriculture 22
Technology and Ocean Exploration 152
Science and Society 100
The Ogallala Aquifer 100
Shrimp Farms—At What Cost to the Environment? 179
Connection 32
Language Arts 32
Social Studies 61
Social Studies 96
Visual Arts 123
Language Arts 162