what makes a volcano erupt?

introduction 

     There's a lot more to volcanic eruptions than meets the eye. They are complicated. They come in many forms and they are caused by a multitude of events.

three types of volcanoes

     Three types of volcanoes are shield volcanoes, strato volcanoes and caldera volcanoes. These can form a big volcanic eruption. 

     When volcanoes erupt, the magma sloshes around in the upper mantle. The magma stores up lava and the eruption happen through the main vent.

      A secondary vent  is a smaller vent  that also has lava.  Eruptions can happen in the main vent and also secondary vents.

Lava and Ash

     A crater may form after an eruption because the pressure builds inside the vents and then explodes from the top of the volcano. 

    At the opening on top of a volcano  there  is  lava, which is hot, melted rock that gets mix together and  shoots ash.  Each eruption that has rock, lava and ash that builds up around the volcano.

Pressure Under the Earth

    A volcano bubbles and gas rises to the surface. Magma chambers are found below the volcano, pushing against Earth's crust. 

   A  volcano erupts when a pressure from a pool of lava builds up and finally escapes through a crack in the Earth. It makes a volcano erupt.  

Ring of Fire 

    Many volcanoes are found along a Aleutian Trench. There is plate boundary called the "Ring Of Fire." This is where most volcanoes occur because lava rises out of the crack in the Earth's crust around the "Ring of Fire."

     The layers of rock and lava and ash build up beneath the cracks to makes the volcano erupt. And  that  is how a volcano erupts.