alex how do volcanos get so much power to blast of into the air

Question: alex how do volcanos get so much power to blast of into the air
- Keywords:
  power,
  volcanos
Asked by nitrogenbomb456 to Alex on 10 Mar 2017.
- Alex Evans answered on 10 Mar 2017:
  
  As far as I know, volcanoes erupt when there is a big build up of molten magma and gas inside them that becomes blocked. The build up of extreme pressure and heat over time results in an EXPLOSIVE eruption that bursts through the blockage and sends the contents of the volcano high into the air!

Question: alex how do volcanos get so much power to blast of into the air