| Ch. 20: Atmosphere | 26 | January 20, 2012 |
| Clouds | 9 | January 20, 2012 |
| Chapter 23: Global Changes | 17 | January 16, 2012 |
| Chapter 22: Glaciers and Ice Ages | 50 | January 16, 2012 |
| Chapter 21: Deserts | 23 | January 16, 2012 |
| Chapter 20: Atmosphere | 52 | January 16, 2012 |
| Chapter 19: Groundwater | 34 | January 16, 2012 |
| Chapter 18: Oceans and Coasts | 39 | January 16, 2012 |
| Chapter 17: The Geology of Running Water | 43 | January 16, 2012 |
| Chapter 16: Landslides and Mass Movements | 20 | January 16, 2012 |
| Chapter 15: Mineral Resources | 19 | January 16, 2012 |
| Chapter 14: Energy Resources | 28 | January 16, 2012 |
| Chapter 13: A Biography of Earth | 23 | January 16, 2012 |
| Chapter 12: Deep Time: How Old Is Old? | 30 | January 16, 2012 |
| Chapter 11: Crags, Cracks, and Crumples: Crustal Deformations and Mountain Building | 39 | January 16, 2012 |
| Chapter 10: Earthquakes | 32 | January 16, 2012 |
| Chapter 9: Volcanoes | 28 | January 16, 2012 |
| Chapter 8: Metamorphic Rocks | 29 | January 16, 2012 |
| Chapter 7: Sediments, Soils, and Sedimentary Rocks | 49 | January 16, 2012 |
| Chapter 6: Igneous Rocks | 37 | January 16, 2012 |
| Chapter 5: Minerals | 18 | January 16, 2012 |
| Chapter 4: The Way the Earth Works: Plate Tectonics | 42 | January 16, 2012 |
| Chapter 3: Drifting Continents and Spreading Seas | 28 | January 16, 2012 |
| Chapter 2: Journey to the Center of the Earth | 29 | January 16, 2012 |
| Chapter 1: Cosmology and the Earth | 19 | January 16, 2012 |
| accomplice-alleviate | 18 | January 7, 2012 |
| abase-accomodate | 13 | January 7, 2012 |
| cumbersome - devious | 18 | January 6, 2012 |
Fermi Constants and Definitions | 126 | January 6, 2012 |