What, you didn’t think I could get through this series without at least one cutaway diagram, did you? Also, I hope you enjoyed seeing the references to other pieces of Mt. St. Helens geologic history. We sometimes forget that geology is always changing, and even mountains aren’t permanent fixtures. The pre-1980 summit and Goat Rocks were both great reminders that the mountain didn’t always look like that, even a handful of generations ago. Granted, the massive change in its silhouette after the 1980 eruption was much more dramatic, but this should serve as a reminder to never take the land for granted.