Chapter 1. Science
UNIT 1 Tornadoes: Severe Thunderstorms
UNIT 2 Different Types of Pollution
UNIT 3 Life in the Polar Regions
UNIT 4 What Roots Do
UNIT 5 Ants Are Social Insects
UNIT 6 Black Holes
UNIT 7 The Causes of Earthquakes
UNIT 8 Everything Is Matter
Chapter 2. Social Studies
UNIT 9 The Grand Canyon
UNIT 10 The Eiffel Tower
UNIT 11 Inventing the Telephone
UNIT 12 Henry Ford: An Icon of the Modern Automobile
UNIT 13 Pompeii Comes Alive
UNIT 14 A Great Earthquake Hits San Francisco
UNIT 15 Endangered Animals
UNIT 16 Stars on Flags
Chapter 3. Language Arts & Math
UNIT 17 The Hunter and the Crocodiles
UNIT 18 How Springtime Comes
UNIT 19 Why We Need Fractions
UNIT 20 Even and Odd: Strange Cousins
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