1when do volcano erupt and2 where do volcano occur and3how do volcano erupt do 1 2 3

1. volcanos erupt when there density is low and the pressure is high.
2. volcanos occur at the edges of plates.
3. Volcanoes erupt when the pressure is about its normal density

1. When the density is low and the pressure is high.

2. At the edges of the plates.

3. When the pressure is about its normal density.

Hope this helped, and please mark brainliest! :)

Afederal parliamentary republic is  unlimited.