The US Geological Survey's Cascade Volcanoes Observatory website has information about all the Cascade volcanoes, including physical descriptions, location, history of eruptions, current seismic activity, alert levels for impending eruptions; information about the national parks and national monuments around the volcanoes; and miscellaneous geology information to teach about volcanoes.
The purpose of the Cascade Volcano Observatory is to monitor volcanoes, particularly in the western U.S., and to teach people about the hazards of volcanoes, earthquakes, landslides, etc., so that they will be knowledgeable about volcanic activity in their area. The CVO monitors volcanic activity, assesses the dangers posed to nearby populations, informs people about the activity, and studies previous eruptions to learn more about volcanoes.
List of websites:
CVO Website http://vulcan.wr.usgs.gov/
Washington Volcanoes http://vulcan.wr.usgs.gov/Volcanoes/Washington/framework.html
Oregon Volcanoes http://vulcan.wr.usgs.gov/Volcanoes/Oregon/framework.html
California Volcanoes http://vulcan.wr.usgs.gov/Volcanoes/California/framework.html
