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Most volcanoes are formed by the movement of tectonic plates on the surface of the earth. These plates are basically huge pieces of rock that 'float' on the mantle (a layer of the earth that is sort-of liquid rock). The tectonic plates are in constant motion, albeit very slow motion. They sometimes move toward each other, other times they'll move apart, and still other times one will sink while the other rises above it.
What else can I help you with?
Are volcanoes made of what they erupt?
Yes, the cone is formed from the ejected material.
Why do some volcanoes erupt in under water?
because they were formed under the sea so when they erupt the can form tsunamis
How does volcanoes from and erupt?
Volcanoes erupt when pressure from inside the earth pushes magma through a weakness in the earth's surface. As more and more magma erupts, the volcano is formed and grows.
Do tsunamis erupt?
No. Volcanoes erupt.
How many volcanoes erupt yearly?
About 60 volcanoes erupt each year.
How many volcanoes can erupt at once?
An unlimited amount of volcanoes can erupt at once
Do volcanoes erupt at the end of the year?
Volcanoes can erupt at any time of year.
What climates do volcanoes need to be in to erupt?
Volcanoes can erupt in any climate. Climate does not affect a volcano's ability to erupt.
What type of volcano does and does not erupt?
Active volcanoes erupt. Dormant volcanoes are quiet - but may erupt again some day. Extinct volcanoes have "closed up shop" for good, and will never erupt again.
Are all volcanoes destructive?
Volcanoes are only destructive to people and property when they erupt. Volcanoes can lie dormant for decades before they erupt. The Hawaiian Islands were all formed from eruptions of volcanoes in the ocean.
Are volcanoes considered volcanoes when they erupt?
Yes, they are.
What makes composite volcanoes to erupt?
Ash and Gas make composite volcanoes erupt i believe
