Problem

VolcanoesLook at the animated map of volcanoes in the animated National Atlas at nationala...

Volcanoes

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.

Describe where most recent earthquakes have occurred, either by dominant states or by mountain ranges/coastlines or other geographic features. Using what you know from this chapter about causes of earth movement and earthquakes, can you explain any of the patterns you see? Find at least one concentration of earthquakes, and try to explain the geological processes that cause them. You might do this with a partner so that you can discuss likely explanations.

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