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When a volcano erupts, hot magma (molten rock), gases and volcanic ash are emitted. The explosiveness of the eruption depends on the consistency of the magma and the amount of pressure built up prior to eruption.

What happens when a volcano erupts? | Reference.com


Volcanoes erupt to release pressure built up in the magma chamber by expelling the magma as lava. Along with lava, a volcanic eruption releases ash and ...

What happens after a volcano erupts? | Reference.com


A volcanic eruption sometimes triggers other natural disasters, including floods, landslides, earthquakes and forest fires. The ash in the air affects both humans ...

What happens when a volcano erupts


An eruption begins when pressure on a magma chamber forces magma up through the conduit ... Volcanic activity is classified by how often a volcano erupts .

How It Happens | Volcanic Eruptions - Video - NYTimes.com


Jan 5, 2015 ... The eruption of a volcano can be one of the planet's most destructive events — spewing huge amounts of rock, gas and ash that can kill people.

Volcano Eruption - Earth Facts and Information


Volcanic eruptions happen deep down inside the earth. When the earth's tectonic plate's shift, it causes more than just earthquakes, it can create new volcanoes ...

What happens when volcanoes erupt - Answers.com


Volcanoes erupt in different ways. Some are quite quiet. Others are very forceful and send tons of stream, ash and rocks into the air.

Why are there volcanoes? Why do they erupt? | Volcano World ...


Volcanoes erupt because of density and pressure. The lower density of the magma relative to the surrounding rocks causes it to rise (like air bubbles in syrup).

What Happens Before a Volcano Blows? | Science | Smithsonian


Feb 7, 2012 ... A caldera is a very large crater that forms after a very large volcanic eruption. The eruption is explosive and ejects a lot of material. Most of what ...

How Do Volcanoes Erupt? - Universe Today


May 26, 2016 ... Volcanic eruptions are driven by a combination of mechanisms, which include pressure and heat in the Earth's mantle, as well as tectonic ...