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.
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:
As of June 2014, the last time Mount Etna erupted was January 2014. The eruption was the first of the year 2014 and was caused by formation of a new crater on the southeastern volcano that resulted from the 2013 eruption.Full Answer >
Some facts about composite volcanoes include the fact that some of the best-known mountains around the world are composite volcanoes. This list includes Mount Fuji in Japan, Mount Hood in Oregon and Mount St. Helens and Mount Rainier in the state of Washington.Full Answer >
It is hard to put an exact figure on the number of extinct volcanoes in the world; according to Oregon State University, the expectation that a volcano will never erupt again is no guarantee that this is actually the case. When it comes to predicting volcanic behavior, there is a lot of potential room for human error.Full Answer >
An erupting volcano emits gases and dust particles that can cause profound changes in weather and climate throughout the world. Volcanism also affects the environment by producing acid rain and making ocean water warmer.Full Answer >