Noun, する verb, and の adjective
ふんか
富士山が噴火したらどうなると思いますか。
What do you think would happen if Mt. Fuji erupted?
When a volcano erupts with fire it makes a really big eruption. You should probably start running.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.