I mean, the asteroid impact that caused a mass extinction could definitely be considered an ecological/natural disaster. It definitely didn't affect humans but could have wiped out life in the universe
Looks like a caldera is just a crater. Supervolcanos don't have to form in calderas.
I'd like to keep singing walruses.
100% with 3:04 left. Watched a show about the Yellowstone supervolcano in the last year or so. That will be an epic event when it goes.
Hence SHIPWRECK should not be on this list. Change the answer to iceberg instead, and it would be consistent with the rest of this quiz.
I was looking for something related to Alternate Current :D