What is volcano how it is made please tell me soon very urgent?

Volcano is a meaningless experiment done by children pretending to do some sort of "science" when they have not learned any science.

Volcano is a natural event when molten rock flows out of a hole in the ground, sometimes with violent explosions.

Volcano is a social situation when someone gets very angry and creates a scene with inappropriate behavior.

Your question does not lead to any particular answer.