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Why are there active volcanoes along the Pacific coast in Washington?

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Why are there active volcanoes along the Pacific coast in Washington and Oregon but not along the eastern coast of the United States?
Thank you!

Hello,

Welcome to JustAnswer!.
The correct answer is as follows:
We all know that volcanoes form near or close to tectonic plate boundaries (Convergent ones). The pacific coast is formed by two of converging ones ..namely pacific and north-american plate. As there are no such plate boundaries along the east coast, there are no volcanoes along the same.

Click the following for more information:
http://vulcan.wr.usgs.gov/Imgs/Gif/PlateTectonics/Maps/map_plate_tectonics_world_bw.gif
http://en.wikipedia.org/wiki/Convergent_boundary

I hope this helped.

Dr. Amit, Professional w/Adv. Degree
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GeologyTutor, Geologist
Category: Homework
Satisfied Customers: 828
Experience: Professional Geologist, Tutored many high school and college students. Sciences and Religion
GeologyTutor and 4 other Homework Specialists are ready to help you