Sorry - I saw this and just didn't have time to respond.
**I am not a volcanologist, and igneous petrology is its own study***
When it comes to volcanoes, there are two types that intrigue me the most, hot spot volcanoes and the decade volcanoes.
Geologists have a decent fundamental understanding as to what causes most volcanoes, usually two plates smash together, and the one with water goes under the one on land. The addition of water to the subsurface allows the rock to melt, then the less dense material (magma) travels upward toward the earths surface, eventually being ejected as lava. Hot spot volcanoes are completely different. They show up in the middle of plates and there’s no agreed upon reason as to why they do. Hawaii is an example of this, so is the Yellowstone caldera. These are really cool to me because geologist have no idea what’s going on with them/what caused the crust to weaken at that point.
The other type of volcanoes are the decade volcanoes. There are 16 volcanoes that have been identified as decade volcanoes that could potentially cause significant destruction and death were ever to erupt.