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What causes a volcano erupt?

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A volcano begins as melted rock (magma) which rises from deep inside the earth toward the surface. As the gas-filled magma rises ...

What causes a volcano to erupt and how do scientists predict ...

www.scientificamerican.com/article/what-causes-a-volcano-to/

Nov 29, 1999 ... When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this ...

What Causes A Volcanic Eruption? | IFLScience

www.iflscience.com/environment/are-explosive-volcanic-eruptions-triggered-frictional-heating/

Jan 6, 2016 ... A team of volcanologists led by the University of Liverpool have released a perhaps controversial Nature study on the causes of volcanic ...

What Causes Volcanoes? Why do Volcanoes Erupt? - WorldAtlas.com

www.worldatlas.com/articles/what-causes-volcanoes-why-do-volcanoes-erupt-where-are-volcanoes-found.html

Jun 30, 2016 ... A volcano is a geological feature of the earth where an opening allows magma to escape from the mantle of the planet.

www.ask.com/youtube?q=what makes volcanoes erupt&v=ShOFQ2h2fws
Jun 19, 2014 ... Volcanoes form when magma from the earth's interior is able to make its way to the surface, via a vent. This is usually associated with plate ...
www.ask.com/youtube?q=what makes volcanoes erupt&v=-kQwudeT3ww
Jun 29, 2013 ... A quick and fun cartoon lesson about volcanoes. Great for teachers and students- hope you guys enjoy! Be sure to subscribe if you like it, there ...

How Do Volcanoes Erupt? - Universe Today

www.universetoday.com/31124/how-volcanoes-erupt/

May 26, 2016 ... Volcanic eruptions are driven by a combination of mechanisms, ... What is it exactly that makes molten rock rise from the Earth's interior and ...

BBC - GCSE Bitesize: Key facts

www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/volcanoes_rev1.shtml

A secondary school revision resource for GCSE Geography covering key facts about volcanoes and volcanic eruptions.

What causes Volcanoes? - Geoscience Australia

www.ga.gov.au/scientific-topics/hazards/volcano/basics/causes

Where plates move away from each other at spreading or divergent plate margins, volcanic eruptions are gentle extrusions of basaltic lava. Most of these occur ...

Facts about Volcanoes for Kids - Primary Homework Help

www.primaryhomeworkhelp.co.uk/mountains/volcanoes.htm

A volcano is a landform (usually a mountain) where molten rock erupts through ... The inner layer is called the core. volcano What causes volcanoes to erupt?

Answer
Several factors trigger volcanic eruptions, including the buoyancy of magma, a build-up of pressure from the gases in the magma and an injection of new magma into a full magma chamber.
When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged.
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Why are there volcanoes? Why do they erupt? | Volcano World ...

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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 makes a volcano erupt? | Reference.com

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Volcanoes erupt due to pressure that the weight of the rocks puts on the magma and forces it to the surface out any available vent or exit provided to it.

Volcanoes - Weather Wiz Kids weather information for kids

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The friction causes earthquakes and volcanic eruptions near the edges of the plates. The theory that explains this process is called plate tectonics. Volcano