Preface
Lessons
1 The History of Space Travel
2 What Is a Botanist?
3 Lakes and Rivers
4 How Flight Is Possible
5 Earth's Layers
Vocabulary Assessment 1-5
6 The Nobel Prizes
7 The Organs of the Body
8 Technology: Overcoming Handicaps
9 Vitamins and Minerals: Diet Basics
10 Gymnastics: A Sport of Balance
Vocabulary Assessment 6-10
11 You Can Grow Plants from Seeds
12 Precipitation
13 Why Is the Ocean Blue?
14 How Humans Hear
15 The History of Numbers
Vocabulary Assessment 11-15
16 Venus: Earth's Sister Planet
17 What Is a Reptile?
18 The Parts of a Flowering Plant
19 Gravity and Air Resistance
20 Some Spiders of North America
Vocabulary Assessment 16-20
Glossary
Personal Dictionary