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When rock inside the Earth becomes hot enough it melts. The molten magma is less thick than the solid rock surrounding it. Just as an object that is less thick than water will float on water, the relatively low density of the magma causes it to rise to the surface of the Earth. If the magma contains water and dissolved gasses, when the magma reaches the surface the water and dissolved gasses will suddenly expand into steam and gas, causing a violent eruption.
a volcano explodes because of the pressure and heat at the bottom of the volcano rocks melt and start to over flow in the volcano
Wiki User
∙ 10y ago
Wiki User
∙ 6y agoIf, however, you mean erupt rather than explode then it's something like:
Magma beneath the volcano comes under very high pressure, which forces it out the volcano, normally through the huge gaping hole at the top. However, very high pressure sometimes means that this hole is not enough, and magma (lava when outside the volcano) will burst out the sides of the volcano, such as the eruption at St. Helens.
I don't know much about science however, I don't know why or how the magma comes under pressure in the first place.
Wiki User
∙ 12y agothey have somthing called evaporation thatmakes it explode
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Do earthquakes explode like volcanoes?
no
What are the disadvatages of volcanoes?
Um...they explode and kill people...
What term is given to large depressions associated with volcanoes that form when volcanoes explode or collapse in the Earth?
That term is 'calderas'
Do volcanoes stop earth from exploding?
No. The Earth won't "explode"! Volcanoes relieve pressure over relatively small areas, but the planet's Crust and interior as a whole are basically in equilibrium.
Why do volcanoes occur in Himalaya?
because moutains are constantly forming by techtonic plates pusing against eachother. some mountains explode
Do earthquakes explode like volcanoes?
no
Do volcanoes in Hawaii explode anymore?
yes
What are volanoes?
volcanoes are mountthat explode lava
Does an island composite volcano explode rapidly or slowly?
The phrase "explode slowly" is an oxymoron. Composite volcanoes, regardless of whether they are island volcanoes or mainland volcanoes, will produce both explosive and non-explosive eruptions.
Does the volcanoes in Spain still explode?
no they dont occur
What are the disadvatages of volcanoes?
Um...they explode and kill people...
What term is given to large depressions associated with volcanoes that form when volcanoes explode or collapse in the Earth?
That term is 'calderas'
In what weather conditions does a volcano explode best?
Weather has no effect on the explosive properties of volcanoes.
Why do Japan's volcanoes have steep slopes?
because japans volcanoes explode. So therefore, the magma does not flow down the volcano making it flat and smooth.
Why don't Hawaii islands explode?
They do! Check out the Volcanoes State Park at Kilauea on the Big Island. They have volcanoes that have been going for 30 years now.
Why is it important for us to know about volcanoes?
because if people are not informed about volcanoes they could erupt and explode and kill us all and we wouldnt have any protocol to escape it.
Why do volcanoes explode after years of silence?
in the magma chamber gasses build up. while it is silent its building up theses ezplosive gasses build up and explode.
