How Many Volcanoes Erupt Each Year?

Answer

There are about 60 volcano eruptions every year. Most of them are very weak. Huge eruptions do not happen very often, and can range from every 100 years to every 10,000 years.
Q&A Related to "How Many Volcanoes Erupt Each Year?"
Different types of volcanoes erupt differently due to different compositions of the magma chambers as well as differnt magma types being present within the volcanoes. The three main
http://wiki.answers.com/Q/Why_eruption_of_each_vol...
Pressure and high temperatures beneath the earth's crust causes rocks to melt down. Melted rock turns into a liquid form known as magma, and this magma is constantly trying to force
http://www.ehow.com/how-does_4620070_volcano-erupt...
Fifty to seventy volcanoes erupt each year. At least 20 volcanoes w...
http://www.chacha.com/question/how-many-volcano-er...
Very broad question! Basically when a plate gets subducted under another the rock turns to molten rock and consequently becomes less dense. As the material is less dense it rises
http://www.quora.com/Why-do-volcanoes-erupt
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