
1) Doomsday scenario 2) Extinction event
Found on
https://www.crosswordclues.com/clue/verneshot

A verneshot (named after French author Jules Verne) is a hypothetical volcanic eruption event caused by the buildup of gas deep underneath a craton. Such an event may be forceful enough to launch an extreme amount of material from the crust and mantle into a sub-orbital trajectory. == Connection with mass extinctions == Verneshots have been propos...
Found on
http://en.wikipedia.org/wiki/Verneshot
No exact match found.