How Volcanoes Form

Source/Author: YouTube (National Geographic)
Subject: Volcanoes
Description: Short Description of Shield Volcanoes, Composite Cones, & Plate Tectonics
Duration: 3:06
Comments: Some nice footage of basaltic eruptions
URL: http://www.youtube.com/watch?v=jRfEGvp6wDU&feature=related

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