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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.

Volcano - Wikipedia

en.wikipedia.org/wiki/Volcano

A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava ... Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. ...

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

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

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 ...

What causes volcanic eruptions? | Reference.com

www.reference.com/science/causes-volcanic-eruptions-dc5320e889d44d86

Volcanic eruptions occur when magma builds up beneath the Earth's crust and forces its way to the surface. Natural vents in the crust allow magma passage to ...

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 ...

Volcanoes and volcanic eruptions - BBC

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

Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava and ash. They occur at destructive (compressional) and constructive ...

What causes a volcano erupt?

www.vtaide.com/png/George/volcanoes.htm

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 volcanic eruption? - The Telegraph

www.telegraph.co.uk/science/0/what-causes-a-volcanic-eruption/

Nov 17, 2016 ... In a volcanic eruption, super-heated magma from within the earth's ... a range of natural phenomena and examines their cause and effect.

What causes Volcanoes? - Geoscience Australia

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

Understanding how volcanoes work and how their eruptions can be predicted is essential for the well-being and ...

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

volcano.oregonstate.edu/why-are-there-volcanoes

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).