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- Mount_St._Helens abstract "Mount St. Helens or Louwala-Clough (known as Lawetlat'la to the indigenous Cowlitz people, and Loowit to the Klickitat) is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle, Washington, and 50 miles (80 km) northeast of Portland, Oregon. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a friend of explorer George Vancouver who made a survey of the area in the late 18th century. The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.Mount St. Helens is most notorious for its catastrophic eruption on May 18, 1980, at 8:32 a.m. PDT, the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. A massive debris avalanche triggered by an earthquake measuring 5.1 on the Richter scale caused an eruption that reduced the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,363 ft (2,549 m), replacing it with a 1 mile (1.6 km) wide horseshoe-shaped crater. The debris avalanche was up to 0.7 cubic miles (2.9 km3) in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for its aftermath to be scientifically studied.As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit, and off its northern flank sat the smaller Goat Rocks dome. Both were destroyed in the 1980 eruption.".
- Mount_St._Helens elevation "2549.0424".
- Mount_St._Helens eruptionYear "2008".
- Mount_St._Helens firstAscentPerson Thomas_J._Dryer.
- Mount_St._Helens firstAscentYear "1853".
- Mount_St._Helens locatedInArea Skamania_County,_Washington.
- Mount_St._Helens mountainRange Cascade_Range.
- Mount_St._Helens nationalTopographicSystemMapNumber "USGSMount St. Helens".
- Mount_St._Helens otherName "Louwala-Clough".
- Mount_St._Helens prominence "1403.604".
- Mount_St._Helens thumbnail MSH82_st_helens_plume_from_harrys_ridge_05-19-82.jpg?width=300.
- Mount_St._Helens type Stratovolcano.
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- Mount_St._Helens wikiPageLength "56690".
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- Mount_St._Helens wikiPageWikiLink Bridge_of_the_Gods_(land_bridge).
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- Mount_St._Helens wikiPageWikiLink Castle_Rock,_Washington.
- Mount_St._Helens wikiPageWikiLink Category:19th-century_volcanic_events.
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- Mount_St._Helens wikiPageWikiLink Category:Cascade_Range.
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- Mount_St._Helens wikiPageWikiLink Category:Gifford_Pinchot_National_Forest.
- Mount_St._Helens wikiPageWikiLink Category:Landforms_of_Skamania_County,_Washington.
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- Mount_St._Helens wikiPageWikiLink Category:Mountains_of_Skamania_County,_Washington.
- Mount_St._Helens wikiPageWikiLink Category:Mountains_of_Washington_(state).
- Mount_St._Helens wikiPageWikiLink Category:National_Register_of_Historic_Places_in_Cowlitz_County,_Washington.
- Mount_St._Helens wikiPageWikiLink Category:National_Register_of_Historic_Places_in_Skamania_County,_Washington.
- Mount_St._Helens wikiPageWikiLink Category:Natural_features_on_the_National_Register_of_Historic_Places.
- Mount_St._Helens wikiPageWikiLink Category:Religious_places_of_the_indigenous_peoples_of_North_America.
- Mount_St._Helens wikiPageWikiLink Category:Sacred_mountains.
- Mount_St._Helens wikiPageWikiLink Category:Stratovolcanoes_of_the_United_States.
- Mount_St._Helens wikiPageWikiLink Category:Subduction_volcanoes.
- Mount_St._Helens wikiPageWikiLink Category:VEI-5_volcanoes.
- Mount_St._Helens wikiPageWikiLink Category:Volcanoes_of_Washington_(state).
- Mount_St._Helens wikiPageWikiLink Champoeg,_Oregon.
- Mount_St._Helens wikiPageWikiLink Chehalis_people.
- Mount_St._Helens wikiPageWikiLink Columbia_River.
- Mount_St._Helens wikiPageWikiLink Columbia_River_Gorge.
- Mount_St._Helens wikiPageWikiLink Compass.
- Mount_St._Helens wikiPageWikiLink Cougar,_Washington.
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- Mount_St._Helens wikiPageWikiLink Fort_Vancouver.
- Mount_St._Helens wikiPageWikiLink Geology_of_the_Pacific_Northwest.
- Mount_St._Helens wikiPageWikiLink George_Vancouver.
- Mount_St._Helens wikiPageWikiLink Gifford_Pinchot_National_Forest.
- Mount_St._Helens wikiPageWikiLink Glacier.
- Mount_St._Helens wikiPageWikiLink HMS_Discovery_(1789).
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- Mount_St._Helens wikiPageWikiLink Harry_Randall_Truman.
- Mount_St._Helens wikiPageWikiLink Helicopter.
- Mount_St._Helens wikiPageWikiLink Highway.
- Mount_St._Helens wikiPageWikiLink Hiking.
- Mount_St._Helens wikiPageWikiLink Holocene.