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4.3
98 reviewsCHAPTER 1
Living Things Need Energy . . . . . . . . . . . . . . . . . . . . iv
Lesson 1 Plants and Sunlight . . . . . . . . . . . . . . . . . . . . . . . . 2
Lesson 2 Food Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lesson 3 Food Webs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Lesson 4 Microorganisms . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
CHAPTER 2
Living Things and Their Environment . . . . . . . . 28
Lesson 1 Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Lesson 2 Living Things Need Each Other . . . . . . . . . . . . . 36
Lesson 3 Changes in Ecosystems . . . . . . . . . . . . . . . . . . . 40
Lesson 4 Adaptations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
CHAPTER 3
Rocks and Minerals . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Lesson 1 Minerals: The Building Blocks of Rocks . . . . . . 54
Lesson 2 Igneous Rocks . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Lesson 3 Sedimentary Rocks . . . . . . . . . . . . . . . . . . . . . . . 64
Lesson 4 Metamorphic Rocks . . . . . . . . . . . . . . . . . . . . . . . 68
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
ii
CHAPTER 4
Slow Changes on Earth . . . . . . . . . . . . . . . . . . . . . . . 78
Lesson 1 Weathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Lesson 2 Erosion and Deposition . . . . . . . . . . . . . . . . . . . 86
Lesson 3 Landforms: Changing Over Time . . . . . . . . . . . 90
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
CHAPTER 5
Fast Changes on Earth . . . . . . . . . . . . . . . . . . . . . . 100
Lesson 1 Landslides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Lesson 2 Earthquakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Lesson 3 Volcanoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
CHAPTER 6
Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Lesson 1 Static Electricity. . . . . . . . . . . . . . . . . . . . . . . . . .122
Lesson 2 Electric Circuits . . . . . . . . . . . . . . . . . . . . . . . . . 130
Lesson 3 Using Electrical Energy . . . . . . . . . . . . . . . . . . .136
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
CHAPTER 7
Magnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Lesson 1 Magnets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Lesson 2 Electromagnets . . . . . . . . . . . . . . . . . . . . . . . . . 150
Lesson 3 Motors and Generators . . . . . . . . . . . . . . . . . . . 154
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
