General info on ring of fire:
http://volcano.und.nodak.edu/vwdocs/frequent_questions/top_101/Volcanoes/Volcanoes7.html

Plate tectonic map of ring of fire:
http://volcano.und.nodak.edu/vwdocs/vwlessons/plate_tectonics/part12.html

Plate tectonic map of ring of fire:
http://vulcan.wr.usgs.gov/Imgs/Gif/PlateTectonics/Maps/plate_tectonics.gif

Current eruptions:
http://volcano.und.nodak.edu/vwdocs/current_volcs/current.html

Map of cascade range:
http://californiacentralcoast.com/map/cascade.gif