This is an awesome site on volcanoes and how they work. It is sponsored by
NASA and SDSU so it is more detailed than many sites. It is fascinating to
learn how they classify volcanoes and how the magma composition affects
erruptions. It is set up as a tutorial with self quizes that are
challenging but not impossible. If you have a few minutes it is great fun.
http://www.geology.sdsu.edu/how_volcanoes_work/
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