Volcanoes of the Cascades
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Description: Their eruptive history and hazards.
Majestic and Perilous Natural Wonders Crown the Pacific Northwest Landscape Seven thousand years ago, Mt. Mazama erupted 14 cubic miles of magma. Volcanic ash rained over a vast expanse of western North America, from Canada to Nebraska. The volume of ejected material would have evenly covered Oregon nine inches deep, or Rhode Island 61 feet deep. By comparison, the tephra (airborne ash and dust) ejected by Mt. St. Helens on May 18, 1980, was estimated to be only one-fiftieth the volume. The largest of volcanic eruptions can eject more than 50 cubic miles of material.
Size: 573 chars
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| Page title: | The Volcanoes of the Cascades |
| Keywords: | volcano, volcanoes, photos, photography, Cascade, Cascades, Cascade Mountains, Mt. Hood, Mt. Rainier, Mt. Shasta, Mt. St. Helens, Mt. Adams, Mt. Mazama, Lassen, Newberry, Mt. Jefferson, Three Sisters, eruption, shield volcano, basalt, James Q. Jacobs, James Jacobs, J. Q. Jacobs, writing, earth science, geology, volcanology, Ring of Fire, caldera, seismic, seismology, earthquake, lahar, Crater Lake, Mt. Baker, Glacier Peak, Mt. Rainier, Mt. St. Helens, Mt. Adams, Washington, Mt. Hood, Mt. Jefferson, Three-Fingered Jack, Mt. Washington, Belknap Shield Volcano, Three Sisters, Broken Top, Mt. Bachelor, Newberry Caldera, Diamond Peak, Mt. Thielsen, Mt. Mazama, Mt. McLoughlin |
| Description: | A descriptive essay of the Cascade volcanoes and their eruptive history. Includes recent Mt St. Helens eruption, formation of Crater Lake. |
| IP-address: | 206.188.193.142 |
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| NS | Name Server: NS33.WORLDNIC.COM Name Server: NS34.WORLDNIC.COM |
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| Date | Creation Date: 14-aug-2001 Expiration Date: 14-aug-2014 |