Look at the animated map of volcanoes in the animated National Atlas at nationalatlas.gov/dynamic.html. (You will need Shockwave to display this movie; you can download Shockwave at the link on this page.) Where are most of the volcanoes in the lower 48 states? Roll over the red dots to see photos and elevations of the volcanoes. As you move down the chain of mountains from north to south, is there a trend in elevations? Look at the Alaska map. How are the volcanoes arranged here? Based on your readings in this chapter, can you explain the pattern?
Where Are Recent Earthquakes?
You can find out about recent earthquakes, where they were, and how big they were, by looking at the USGS earthquake information page, earthquake.usgs.gov/. Click on the map to investigate recent events.
Now choose a map (conterminous U.S., Alaska, Hawaii, or Puerto Rico), and look at the magnitude of recent earthquakes: compare the size of squares to the magnitude numbers in the legend. What size class is most dominant? What proportion of earthquakes on your chosen map are in the largest size class?
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