Question

why do volcanoes erupt?

Answer 1

Hi frnd,

Volcanoes erupt because of pressure and density

hope it helps

Answer 2

Volcanoes erupt because of density and pressure the lower density of the magma relative to the surrounding rocks causes it to rise .it will rise to the surface or to a depth that is determined by the density of the magma and the weight of the rocks above it...............

here are some pics as well
hope this helps