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| | USGS Geology in the Parks |
 | | Although the largest volcanoes like Mount St. Helens get the most attention, the Cascades is really made up of a band of thousands of very small, short-lived volcanoes that have built a platform of lava and volcanic debris. |
 | | Mount St. Helens, shown above, and at least six other volcanoes in the Cascade Range have erupted at least once during historical time. |
 | | Major volcanic centers are Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, Mount Adams, Mount Hood, Mount Jefferson, Three Sisters, Newberry Caldera, Crater Lake (Mount Mazama), Medicine Lake, Mount Shasta, and Lassen Peak. |
| geopubs.wr.usgs.gov /docs/parks/province/cascade1.html (240 words) |
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