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4.1
100 reviewsCHAPTER 1
Adaptations in Land Environments . . . . . . . . . . . . . 1
Lesson 1 Living Things and Their Needs . . . . . . . . . . . . . . 2
Lesson 2 Life in the Desert . . . . . . . . . . . . . . . . . . . . . . . . 10
Lesson 3 Life in the Grassland . . . . . . . . . . . . . . . . . . . . . 16
Lesson 4 Life in the Forest . . . . . . . . . . . . . . . . . . . . . . . . 22
Lesson 5 Life in the Arctic Tundra . . . . . . . . . . . . . . . . . . 30
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
CHAPTER 2
Adaptations in Water Environments . . . . . . . . . . 39
Lesson 1 The Water Planet . . . . . . . . . . . . . . . . . . . . . . . 40
Lesson 2 Life in an Ocean . . . . . . . . . . . . . . . . . . . . . . . . 46
Lesson 3 Life in the Wetlands . . . . . . . . . . . . . . . . . . . . . 54
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
CHAPTER 3
Environments Change . . . . . . . . . . . . . . . . . . . . . . . . . 61
Lesson 1 Living Things Change Their Environment . . . . 62
Lesson 2 Changes Affect Living Things . . . . . . . . . . . . . . 68
Lesson 3 Living Things of the Past . . . . . . . . . . . . . . . . . 76
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
CHAPTER 4
Our Earth, Sun, and Moon . . . . . . . . . . . . . . . . . . . . 85
Lesson 1 Day and Night . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Lesson 2 The Seasons . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Lesson 3 The Moon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
iii
CHAPTER 5
Our Solar System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Lesson 1 The Sun and Its Planets . . . . . . . . . . . . . . . . . 106
Lesson 2 Telescopes: Discovering the Solar System . . . . 112
Lesson 3 The Stars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
CHAPTER 6
Matter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Lesson 1 Solids, Liquids, and Gases . . . . . . . . . . . . . . . . .126
Lesson 2 Building Blocks of Matter . . . . . . . . . . . . . . . . .134
Lesson 3 Changing Matter . . . . . . . . . . . . . . . . . . . . . . 140
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
CHAPTER 7
Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Lesson 1 Energy All Around . . . . . . . . . . . . . . . . . . . . . . 148
Lesson 2 Using Energy . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Lesson 3 Energy on the Move . . . . . . . . . . . . . . . . . . . . 162
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170
CHAPTER 8
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
Lesson 1 How Light Moves . . . . . . . . . . . . . . . . . . . . . . .172
Lesson 2 Seeing Light and Color . . . . . . . . . . . . . . . . . . .178
Lesson 3 Shadows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Vocabulary Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
