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Monday, June 14, 2010

Volcano Report



people might think what is a volcano. Volcanoes are mostly shaped like a cone. When a underwater volcano erupts it can cause a Tsunami . volcanologist(scientist who study volcanoes) say there are more than 1500 active volcanoes in the world.


A volcano is formed on edge of the plates. As the plates crash we can feel shifting in many ways. Like through earthquakes and volcanoes.


A volcano eruption occurs by the mantle getting to hot(The mantle can go up to 4000 Degrees Celsius). Mantle has magma in it. When the mantle gets to hot,plates collide then the magma goes through the earths cracks and explodes. That is whey I think volcano in Latin mean 'break out'.


There are three main different types of volcanoes in the world . They are called cinder cone,Strato and shield volcano.


Shield volcano

Shield volcanoes are one of the three different types. The shield volcanoes are shaped like a ancient warriors that is where it got its name. The distinctive features are its flat bottomed craters and shallow sided mounds. Its low-silica magma produces long lava flows. Most shield volcanoes are also found on crust.



Strato volcanoes

Strato volcanoes are really famous. Mt Vesuvius,Mt St.Helen's and Mt Fuji are Strato volcanoes. A strato is really explosive of ash and cinder its magma is also terribly viscous. They also have layering of ash,lava and has steep walled craters.


Cinder cone

The cinder cone is one of the most common volcanoes in the world. Cinder cone volcanoes explode and sputter out fragments called cinders(That is where it got its name). They are important to us because
cinder cones are all around Auckland.


Most recent eruption

The most recent eruption has been really terrible. It has caused people to sleep in airports and has delayed a lot of flights. Now that the volcano in Iceland has calm down everything in airports are back to normal.



Conclusion

Even though eruptions can look really fascinating. They are dangerous and all over the world.

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