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Lesson 1.1 The Long Beginning
Lesson 1.2 Early Life
Lesson 1.3 Strange Rocks
Lesson 1.4 Getting a Handle on Time
Lesson 1.5 Pinpointing Time
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Lesson 2.1 The Cambrian Explosion
Lesson 2.2 A Billion-Dollar Reef
Lesson 2.3 Earthquakes
Lesson 2.4 Raising the Rockies
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Lesson 3.1 The Great Cooling
Lesson 3.2 The Icy Epoch
Lesson 3.3 Explaining and Predicting Climate Change
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