Other contributors have said "Is it hot when a volcano erupts?" is the same question as "What do underwater volcanic eruptions cause?" If you believe that these are not asking the same thing and should be answered differently, click here
good question, well i have alot more info about earthquakes more then i do with volcanic eruption's. Earthquakes: Well on each planet there are plates. Plates are little spinning things on earth's...
A volcano erupts because there is mass pressure under it. In a volcano there is lava the lava has gasses that make the eruption. When there is to much it bursts the volcano. Ex. Its like a soda can....