TO THE STUDENT 2
THE SOLAR SYSTEM 3
Introduction 5
Unit 1 What's Your Space Address? 6
Unit 2 The Planet We Live On 11
Unit 3 Our Moon 18
Unit 4 Our Sun 27
Unit 5 Our Solar System 33
Unit 6 Exploring Our Solar System 40
Show What You Learned 48
CHANGING EARTH 49
Introduction 51
Unit 1 The Land Around You 52
Unit 2 Inside Moves 57
Unit 3 Mountains 65
Unit 4 Wearing Down Mountains 71
Unit 5 Climate 81
Unit 6 People Change the Earth 87
Unit 7 The Land You Live On 92
Show What You Learned 94
WEATHER 95
Introduction 97
Unit 1 Hot or Cold? 98
Unit 2 How Windy Is It? 103
Unit 3 Heavy Air 113
Unit 4 Water in the Air 120
Unit 5 Water from the Sky 128
Unit 6 What Will the Weather Be Like? 137
Show What You Learned 140
EARTH RESOURCES 141
Introduction 143
Unit 1 Air 144
Unit 2 Water 151
Unit 3 Living Off the Land 159
Unit 4 Fossil Fuels 167
Unit 5 Minerals 175
Unit 6 Save Your Resources! 182
Show What You Learned 186
GLOSSARY 187