Eruption
noun, する verb, の adjective
When a volcano erupts with fire it makes a really big eruption. You should probably start running.
ふんか
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
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?