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What happens when a volcano erupts? | Reference.com

www.reference.com/science/happens-volcano-erupts-b099f9c1fd7e5615

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 ...

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

www.nytimes.com/video/science/100000003431211/how-it-happens-volcanic-eruptions.html

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.

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).

What happens when volcanoes erupt - Answers.com

www.answers.com/Q/What_happens_when_volcanoes_erupt

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

What happens before, during and after a volcanic eruption? | Yahoo ...

answers.yahoo.com/question/index?qid=20080414080341AAx7Bz8

Can you give me a few for each, please :) ... This Site Might Help You. RE: What happens before, during and after a volcanic eruption? Can you give ...

What Happens Before a Volcano Blows? | Science | Smithsonian

www.smithsonianmag.com/science-nature/what-happens-before-a-volcano-blows-89286347/

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 ...

What happens during an volcanic eruption

maps.unomaha.edu/maher/linked/week12/volcanichazards.html

Volcanic hazards and prediction. What happens during an volcanic eruption: Types of volcanic eruptions are quite varied, dependent on the type of magma, the ...

What will happen when the eruption ends?

hvo.wr.usgs.gov/volcanowatch/archive/2000/00_11_03.html

Nov 3, 2000 ... Earthquakes · Other Volcanoes. Volcanic Hazards ... In fact, this could even happen before the Pu`u `O`o eruption ends. Many people believe ...

What If Every Volcano on Earth Erupted at Once? - Live Science

www.livescience.com/49305-what-if-all-volcanoes-erupted.html

Jan 2, 2015 ... Every day, between 10 and 20 volcanoes are erupting somewhere on Earth, but scientists say the chance of every ... But what if it did happen?

Volcanoes and volcanic eruptions - BBC

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

Volcanic eruptions can happen at destructive and constructive boundaries, but not at conservative boundaries. Some volcanoes happen underwater, along the ...

Answer
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.
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What happens when a volcano erupts

www.edu4hazards.org

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 Do Volcanoes Erupt? - Universe Today

www.universetoday.com

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 ...

Volcano Eruption - Earth Facts and Information

www.basicplanet.com

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 ...