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When rock inside the Earth becomes hot enough it melts.This molten rock, or magma, is less dense than the surrounding solid rock. Just as an object that is less dense 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 due to a desrease in pressure, causing a violent eruption. This is like shaking a coke can and then popping the tab.
Wiki User
∙ 13y ago
Wiki User
∙ 16y agoDepends on what volcano you are talking about. The volcanos of Hawaii for instance are not violent at all. Lava kind of pours out of them like snot and that's it. They are called shield volcanos. The reason why their eruptions are gentle is the composition of their lava. Their lava has a low silicate content so that it does not take much pressure to force the lava rock up and out of the volcano. However... volcanos like Mt. Vesuvus in Italy and Mt. St. Helens in Washington have lava rock that has a very high silicate content, which causes enormous pressure to build up in the magma chamber of the volcano before it can break through the seal and erupt. So when they finally do erupt... its big.
Wiki User
∙ 10y agoAt a destructive playe boundary, an oceanic plate slides or subducts beaneath another plate and plunges into the mantle. As this happens, the oceanic plate takes some water with it. This water seeps into the superheated rocks of the mantle and lowers their melting point. Molten rock, called magma, then rises to the surface through the crust, emerging in volcanic eruptions.
Wiki User
∙ 14y agobecause of the movement of plates
Wiki User
∙ 11y agoscientist .................dont know!!XD
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Where are the majority of earthquakes and volcanoes in relation to the plate boundaries?
Most earthquakes occur on plate boundaries such as Japan and Chile and most volcanoes occur in diverging plate boundaries like Dallol and Iceland and the Pacific Ring of Fire like Ecuador and Indonesia
What type of plate boundaries do stratovolcanoes occur?
At constructive plate margins (where two plate slide away from each other) or a destructive plate boundary (where two plates slide together), volcanoes do not occur at a conservative plate margin. Hope this helps
What types of Volcanoes can occur far from any plate boundaries?
Shield volcanoes may occur far from any plate boundaries.
Are Brazil likely to have earthquakes and volcanoes why?
No. This is because it is not near the plate boundaries
Which country is known as country of earthquakes and volcanoes?
Earthquakes and volcanoes are usually found near plate boundaries.
Where are the majority of earthquakes and volcanoes in relation to the plate boundaries?
Most earthquakes occur on plate boundaries such as Japan and Chile and most volcanoes occur in diverging plate boundaries like Dallol and Iceland and the Pacific Ring of Fire like Ecuador and Indonesia
Where are earthquakes and volcanoes found around the world?
Where tectonic plates are converging and diverging with each otherThey are mostly found around the Pacific "Ring of Fire", and more generally on any destructive or contstructive plate boundary.Most occur on destructive plate boundaries. The Pacific 'ring of fire' is an example of a long series of destructive plate margins and most volcanoes and earthquakes on Earth are on it.
Are volcanoes only found on constructive plate boundaries?
No
What volcanoes are found in divergent plate boundaries?
major ones
What observations can you make about the relationship between volcanoes and plate boundaries?
Volcanos are usually found over subducting plate boundaries.
Why are active volcanoes found in Japan and Indonesia?
Because they are on plate boundaries
What geologic processes and or phenomena is not found at transform plate boundaries?
volcanoes
What is the difference between hotspot volcanoes and volcanoes formed at plate boundaries?
hotspot volcanoes are formed away from the edge of plate boundaries. Plate boundary volcanoes are near a plate boundary
What is a fault of a volcano?
A volcano is not a type of fault. Volcanoes can be found at convergent and divergent plate boundaries and away from plate boundaries at hot spots.
What plate boundary is a composite volcano on?
Composite volcanoes most often are found near subduction zones. They can be found at either oceanic-oceanic convergent plate boundaries, oceanic-continental plate boundaries, or continental-continental plate boundaries. They are especially prevalent in the Pacific Ring of Fire. A few composite volcanoes, however, have been found at divergent boundaries and away from plate boundaries at hot spots.
How Compare shield volcanoes and composite volcanoes?
Shield Volcanoes - Wide base found at constructive plate margins Composite Volcanoes - Steeper Sides found at Destructive (subduction) margins
What type of fault is a volcano?
A volcano is not a type of fault. Volcanoes can be found at convergent and divergent plate boundaries and away from plate boundaries at hot spots.
