| Abstract: | Volcanoes destroy and volcanoes create. The catastrophic eruption of Mount St. Helens on May 18, 1980, made clear the awesome destructive power of a volcano. Yet, over a time span longer than human memory and record, volcanoes have played a key role in forming and modifying the planet upon which we live. More than 80 percent of the Earth‘s surface--above and below sea level--is of volcanic origin. Gaseous emissions from volcanic vents over hundreds of millions of years formed the Earth‘s earliest oceans and atmosphere, which supplied the ingredients vital to evolve and sustain life. Over geologic eons, countless volcanic eruptions have produced mountains, plateaus, and plains, which subsequent erosion and weathering have sculpted into majestic landscapes and formed fertile soils. |
| Genre: | USGS Unnumbered Series |
| ProdID: | 2824 |
| Citation Author: | Tilling, Robert I. Geological Survey (U.S.) |
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| Citation Edition: | On-line ed. |
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| Citation Language: | ENGLISH |
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| Citation No Pagination: | Y |
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| Citation Phsyical Description: | HTML Document |
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| Citation Publisher: | U.S. Dept. of the Interior, U.S. Geological Survey, |
| Citation Series: | General Information Product |
| Citation Series Code: | GIP |
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| Citation Search Results Text: | Volcanoes; 1998; USGS Unnumbered Series; GIP; Tilling, Robert I. Geological Survey (U.S.) |
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| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Volcanoes; 1998; USGS Unnumbered Series; GIP; Tilling, Robert I. Geological Survey (U.S.) |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/gip/volc |
| Date Other: | Tue, 1 Jan 2013 00:00 -0600 |
| Publisher: | U.S. Dept. of the Interior, U.S. Geological Survey, |
