Preface Lessons 1 Using Energy to Ride a Bike 2 Animals of the Forests 3 The Constellations 4 The Need for Plants 5 What Is a Veterinarian？ Vocabulary Assessment 1-5 6 The Features of Earth's Surface 7 Simple Machines 8 The Discoveries of Benjamin Franklin 9 The Truth About Sharks 10 Types of Clouds Vocabulary Assessment 6-10 11 A Key to Good Health 12 Crossing the Land with Steam Power 13 Seasons Around the World 14 What Is a Mammal？ 15 Organizing a Science Project Vocabulary Assessment 11-15 16 Rocks and Minerals 17 Water Is Needed for Life 18 Flowering and Nonflowering Plants 19 Waste and Recycling 20 Elijah McCoy， Inventor Vocabulary Assessment 16-20 Glossary Personal Dictionary
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