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Volcano - Wikipedia


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 ... (also know...

What causes a volcano erupt?


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

What makes a volcano erupt? | Reference.com


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.

How Do Scientists Know a Volcano Is About to Erupt? - Live Science


Oct 25, 2010 ... Mount Merapi is expected to erupt at any moment, and Indonesian officials ... " Rising magma causes solid rock to break, sending earthquake ...

Why do volcanoes erupt? What creates eruptions? - eSchooltoday


... the earth forces molten matter to be expelled out to the surface, causing a volcanic eruption. ... Did you know? ... Let us start with what the earth is made of:

Volcanoes - Weather Wiz Kids weather information for kids


Eruptions can cause lateral blasts, lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. Volcano eruptions have been known to knock down ...

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 ... How It Happens | Man-Made Quakes.

What Causes A Volcanic Eruption? | IFLScience


Jan 6, 2016 ... What causes the world's explosive volcanic eruptions, like the 1980s ... gas bubbles form from the magma in a process known as vesiculation, ...

11 Facts About Volcanoes | DoSomething.org | Volunteer for Social ...


Eruptions can cause lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. The danger area around a volcano covers about a 20-mile radius.

Volcano Facts, Volcano Information, Volcano Videos, Volcano ...


Get Volcano facts, photos, wallpapers, news and safety tips at National ... Ash and toxic gases can cause lung damage and other problems, ... Scientists estimate that more than 260,000 people have died in the past 300 years from volcanic eruptions and their aftermath. ... Quiz: What You Don't Know About Energy.

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


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 ...

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).

Facts about Volcanoes for Kids - Primary Homework Help


A volcano is a landform (usually a mountain) where molten rock erupts through the surface of ... We currently know of 80 or more which are under the oceans.