How do volcanoes erupt - Computers & Internet

NO, but it did erupt SNOW last December...
Yellowstone Volcano Frequently Asked Questions

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). It will rise to the surface or to a depth that is determined by the density of the magma and the weight of the rocks above it. As the magma rises, bubbles start to form from the gas dissolved in the magma. The gas bubbles exert tremendous pressure. This pressure helps to bring the magma to the surface and forces it in the air, sometimes to great heights.

Volcanos erupt when the pressure from above the magma chamber holding it in, becomes less that the amount of pressure within the magma chamber forcing it out. Drastic pressure changes can occur due to shifts in tectonic plates and energy ripples flowing across the magma until it finds weak areas to breach.

water
Two plates meet up crust is weak volcano appear at these.
Movements in the crusts can also cause pressure to build up .
If hot lava contacts with water . Steam (correction super heated steam) is created under the volcano and builds up pressure until the cool lava to top cannot keep the steam contained and boom.
https://en.wikipedia.org/wiki/Types_of_volcanic_eruptions

The steam can also cause a geyser to occur which is usually less devastating as steam blows out regularly. Happens in Yellowstone Park in USA.
https://en.wikipedia.org/wiki/Old_Faithful

17 erruptions

a steaming hump of dirt. stand back!

OK, the whole Hawaiian Island chain is volcanic, formed from volcanoes which rose in turn from the ocean floor, erupted, formed an island around, then became less and less active in turn as the whole island chain moves away to the NW at 2 - 4 in per year.

Mauna Loa is one of 5 volcanoes which have formed the main island Hawaii. It is still active, and is a wide flattish volcano 4169 metres above sea level (13 679 ft).

It probably started erupting under the sea about 700 000 yrs ago, and rose above the surface about 400 000 yrs ago. It is a young volcano in geological terms as the oldest rocks found on its surface are 200 000 yrs old.

There is heaps more info here, but take care as some teachers do not like you to quote Wikipedia as a reference.

http://en.wikipedia.org/wiki/Mauna_Loa

When volcanoes erupt, lava flows out, right? Then when lava hardens, extraneous igneous rocks are formed. Oh! Also, volcanic eruptions also gives birth to another land from like hills!!

volcanoes are formed by tectonic plate friction. Asplate rub against each other, they form cracks, gaps, and voids, that can fill with the magma in the earth's mantle. AThis magma is under extremely high pressure, and any crack or gap that it can find, it will use. As a volcano forms above the surface, there will be a ***** or cone that forms above the volcano, and as presure builds underneath, the volcano grows, sometimes to very high altitudes, before it ever eruprts. Sometimes, it will die out, losing it's pressure, and go dormant. Ther is NO SUCH THING as a DEAD vocalno, they just are dormant for longer periods of time. Some of the volcanoes here on earth have erupted alot, others have only erupted sporadically, but If it eprupts even once, then eventually it will erupt again.

you will find the instruction here http://unclemilton.com/company/manuals/MustafarVolcanoLab.pdf