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Chapter 4: Volcanism and Extrusive Rocks
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http://volcano.und.nodak.edu/ Volcano World. "What's New," "Volcano of the Week," and "current eruptions," provide up to date information on new and ongoing eruptions around the world. You can also sign up to be notified through e-mail of new volcanic activity. From the Volcano World home page using the volcano list find and go to Shasta, Mount. What rock forms Mt. Shasta? How long ago did the Shastina cone form? What is the youngest eruptive center? During the last 3,500 years, what has been the frequency of eruption of Mt. Shasta? Return to the Volcano World home page and under the volcano list find and go to Shasta, Mount. What rock forms Mt. Shasta? How long ago did the Shastina cone form? What is the youngest eruptive center? During the last 3,500 years, what has been the frequency of eruption of Mt. Shasta? Go to the St. Helens site for some great pictures of Mt. St. Helens. http://vulcan.wr.usgs.gov/ The USGS Cascade Volcano Observatory Site. Under the volcanoes list, click on Mt. St. Helens. Click on VolcanoCam to see a live view of the volcano. Assuming good visibility, can you visually reconstruct the volcano's shape before the huge 1980 eruption? Can you see the dome? Is it steaming? Go back and click on "Description: Mt. St. Helens volcano." When did it last erupt before 1980? Read about the May 18, 1980 eruption. What were the effects of the lateral blast? 
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