Science

Cover......Page 1
Contents......Page 6
Be a Scientist......Page 18
What Is Science?......Page 19
Inquiry Skills......Page 21
Observe......Page 22
Predict......Page 23
Communicate......Page 24
Measure......Page 25
Sequence......Page 26
Compare......Page 27
Use Tools......Page 28
Scientific Method......Page 29
Observe and Ask a Question......Page 30
Make a Plan......Page 31
Follow the Plan......Page 32
Record the Results......Page 33
Try the Plan Again......Page 34
Draw a Conclusion and Communicate......Page 35
Life Science......Page 36
CHAPTER 1 Plant Life Cycles......Page 37
The Seed......Page 39
Lesson 1 Plants and Their Parts......Page 41
How are leaves a like and different?......Page 42
What do roots, stems, and leaves do?......Page 43
How can we describe roots?......Page 45
What do flowers, fruit, and seeds do?......Page 47
Focus on Skills......Page 49
Lesson 2 Flowers and Fruits......Page 51
What are the parts of a seed?......Page 52
How do flowers make seeds?......Page 53
How do seeds look?......Page 55
How do seeds move?......Page 57
Main Idea and Details......Page 59
How many seeds?......Page 60
Lesson 3 Plants Grow and Change......Page 61
What will grow from a seed?......Page 62
How are plants like their parents?......Page 63
What is a life cycle?......Page 65
How are wild flowers alike and different?......Page 67
Lesson 4 Plants and Their Environments......Page 69
How do roots grow?......Page 70
How can plants change to get what they need?......Page 71
What traits help plants live in their environments?......Page 73
The Power of Periwinkle......Page 75
Amazing Plants......Page 77
CHAPTER 1 Review......Page 83
CHAPTER 2 Animal Life Cycles......Page 87
In Payment......Page 89
Lesson 1 Kinds of Animals......Page 91
How can we put animals into groups?......Page 92
How do we classify animals?......Page 93
How can we classify animals with backbones?......Page 95
How can we classify animals without backbones?......Page 97
Focus on Skills......Page 99
Lesson 2 Mammals......Page 101
How are babies and adults alike and different?......Page 102
How does a mammal grow and change?......Page 103
How are baby mammals and their parents alike and different?......Page 105
Meet Nancy Simmons......Page 107
Lesson 3 Animals from Eggs......Page 109
How do birds keep their eggs safe?......Page 110
Why do many animals lay eggs?......Page 111
How do animals from eggs become adults?......Page 113
How does a butterfly grow and change?......Page 115
How does a mealworm grow?......Page 117
Lesson 4 Animal Traits......Page 119
How are these zebras alike and different?......Page 120
How do traits help animals?......Page 121
What is a population?......Page 123
How can we compare animals in the same population?......Page 125
Helpful Traits......Page 127
Parts of a Group......Page 128
Tricky Traits......Page 129
CHAPTER 2 Review......Page 135
A Frog's Life......Page 139
Earth Science......Page 141
CHAPTER 3 Earth’s Materials......Page 143
Under a Stone......Page 145
Lesson 1 Rocks......Page 147
How can we sort rocks?......Page 148
How can we describe rocks?......Page 149
What are rocks made of?......Page 151
How can we describe minerals?......Page 153
Focus on Skills......Page 155
Lesson 2 Rocks Change......Page 157
How can you change rocks?......Page 158
How do rocks change?......Page 159
What other ways can rocks change?......Page 161
Rock and Stroll......Page 162
Rock Patterns......Page 163
Rocks Rule......Page 165
Lesson 3 Soil......Page 166
What is in soil?......Page 168
What is in soil?......Page 169
What are some kinds of soil?......Page 171
How do animals help soil?......Page 173
Which soil is better for growing plants?......Page 175
Rocks on the Move......Page 177
CHAPTER 3 Review......Page 183
CHAPTER 4 Earth’s Past......Page 187
Dinosaur Bone......Page 189
Lesson 1 Fossils......Page 191
How can we get clues from prints?......Page 192
What are fossils?......Page 193
How do fossils form?......Page 194
Focus on Skills......Page 197
Life of a Dinosaur......Page 199
Measuring Dinosaurs......Page 200
Lesson 2 Finding Clues in Fossils......Page 201
What clues can you find in this fossil?......Page 202
How can fossils help us learn about the past?......Page 203
What can fossils teach us about extinct animals?......Page 205
How do clues help scientists put fossils together?......Page 207
Lesson 3 Fossils of California......Page 209
How do animal fossils compare to animals today?......Page 210
What are the La Brea Tar Pits?......Page 211
What other fossils are found in California?......Page 213
Meet Mike Novacek......Page 215
Found Fossils......Page 217
CHAPTER 4 Review......Page 223
CHAPTER 5 Earth’s Resources......Page 227
Sun......Page 229
Lesson 1 Natural Resources......Page 231
What ways do you use water?......Page 232
What are natural resources?......Page 233
How do we use rocks and soil?......Page 235
How do we use water and wind?......Page 236
Focus on Skills......Page 239
Lesson 2 Plant and Animal Resources......Page 241
How do we use plants and animals?......Page 242
How do we use plants?......Page 243
How do people use animals?......Page 245
What happens when you shake cream?......Page 247
A World of Wool......Page 249
Lesson 3 Resources of California......Page 251
How can we use the Sun’s light?......Page 252
How does California get energy?......Page 253
What are other natural resources of California?......Page 255
Sun Power......Page 257
Gold Rush......Page 258
Curious About Cotton......Page 259
CHAPTER 5 Review......Page 265
Earthworms Soil Helpers......Page 269
Careers in Science......Page 271
Physical Science......Page 272
CHAPTER 6 Objects in Motion......Page 273
If......Page 275
Lesson 1 Position......Page 277
Where is it?......Page 278
How can you describe where something is?......Page 279
How do you measure distance?......Page 281
Focus on Skills......Page 283
Lesson 2 Motion......Page 285
How do different things move?......Page 286
How can you tell if something has moved?......Page 287
What is speed?......Page 289
Which toy moves faster?......Page 291
Lesson 3 Pushes and Pulls......Page 293
How do you make things go farther and faster?......Page 294
What are forces?......Page 295
What happens when a force changes?......Page 297
Travel Through Time......Page 299
Lesson 4 Changing Motion......Page 301
How can you slow something down?......Page 302
What slows things down?......Page 303
How can forces change motion?......Page 305
Slip and Slide......Page 307
How far did it move?......Page 308
Roller Coaster Ride......Page 309
CHAPTER 6 Review......Page 315
CHAPTER 7 Forces at Work......Page 319
Magnet......Page 321
Lesson 1 Tools and Machines......Page 323
How can a push help you lift something?......Page 324
What makes work easier?......Page 325
What is a tool?......Page 327
Focus on Skills......Page 329
Lesson 2 Gravity......Page 331
Does one fall faster?......Page 332
What is gravity?......Page 333
What is weight?......Page 335
Meet Hector Arce......Page 337
Lesson 3 Magnets Push, Magnets Pull......Page 339
What sticks to a magnet?......Page 340
What does a magnet pull?......Page 341
What are poles?......Page 343
How can you compare the strengths of different magnets?......Page 345
Lesson 4 Sound......Page 347
How is sound made?......Page 348
What is sound?......Page 349
What makes sounds loud or soft?......Page 351
What is pitch?......Page 353
Sound Off!......Page 355
Drum Fun......Page 356
Weight in Space......Page 357
CHAPTER 7 Review......Page 363
Echolocation......Page 367
Careers in Science......Page 369
Reference......Page 370
Science Content Standards......Page 371
Recycle......Page 373
Clean Up......Page 374
Care of Plants......Page 375
Care of Animals......Page 376
How to Measure......Page 377
Measure in Centimeters......Page 379
Measure in Inches......Page 380
Use a Measuring Cup......Page 381
Use a Balance......Page 383
Use a Scale......Page 384
Use a Thermometer......Page 385
Use Weather Tools......Page 387
Use a Clock......Page 389
Use a Hand Lens......Page 390
Use a Computer......Page 391
Glossary......Page 392
Credits......Page 404