GVP Frequently Asked Questions
30 Jun 2011 | Contributor(s): Ed Venzke
http://www.volcano.si.edu/education/questions/What is a volcano?What is an eruption?How many active volcanoes are there in the world?What is the world's highest volcano?How long does an eruption last?Has volcanic activity been increasing?Why doesn't the Smithsonian post hazard alert levels for...