Volcano Worldhttp://volcano.und.edu/
Volcano Imageshttp://volcano.und.edu/volcanoes.html
How Volcanoes Workhttp://www.geology.sdsu.edu/how_volcanoes_work/
Predicting volcanoeshttp://www.learner.org/interactives/volcanoes/entry.html
US geological Surveyhttp://volcanoes.usgs.gov/
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