According to the Global Volcanism Program at the Smithsonian Institution, as of December 2014, there have been a little over 400 confirmed eruptions in the world since January 2004. These eruptions range on the Volcanic Explosivity Index, or VEI, from 0 up to 5. A VEI of 0 to 1 is very small, while 5 is classified as very large.Continue Reading
Many volcanoes erupt every day, all over the world. Some are very small and have little to no effect on the surrounding environment. The degree and danger of the volcano's explosiveness is in direct relation to the amount of gas trapped in its magma and how easily the magma can flow out of the volcano.
There are three basic types of volcanoes: