1. Title page: The Case of the Missing Rumbleometer 2. Premise: A mystery to solve 3. The missing rumbleometer 4. Glossary 5. Part 1 - Introduction and background 6. Axial Volcano 7. Juan de Fuca Ridge 8. Mid-ocean ridges 9. Plate tectonics 10. Hydrothermal vents 11. Black smokers (with movie link) 12. Chemosynthesis 13. Tubeworms (with movie link) 14. The ROPOS vehicle 15. What happened to the rumbleometer? 16. Get ready to set sail 17. Credits