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Mount Rogers: Blast from the past - Roanoke.com (949 words) |
 | The East Coast was rocked by a violent volcanic eruption on the scale of the 1980 Mount St. Helens disaster. |
| Mount Rogers technically isn't a volcano, but it's got rock that came from a large eruption 750 million years ago, said Robert Tracy, a Virginia Tech professor who teaches a course on volcanoes. |
| Despite the eruption's similarities with the 1980 explosion at Mount St. Helens, the reasons behind it are nearly opposite, though both have to do with plate tectonics, the basis for much of modern geology. |
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