TABLE OF CONTENTS 4 CHAPTER 1 Layers of Ice and Snow CHAPTER 2 Leaving Their Mark CHAPTER 3 The Future of Glaciers 8 18 ACTIVITIES TOOLS Try This Glossary Index To Learn More 22 23 24 24
CHAPTER 1 LAYERS OF ICE AND SNOW The Great Ice Age began about 2.6 million years ago Thick continental glaciers covered much of Earth Our planet was much colder continental glacier 4 CHAPTER 1
These glaciers are also called ice sheets They spread across huge areas Most of them melted when the Great Ice Age ended This was about 12,000 years ago Today they still cover Greenland and Antarctica Antarctic ice sheet CHAPTER 1 5
