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Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States.
A massive debris avalanche reduced the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,365 ft (2,550 m) and replaced it with a 1 mile (1.6 km) wide horseshoe-shaped crater.

Mount St. Helens - Wikipedia

en.wikipedia.org/wiki/Mount_St._Helens

Mount St. Helens or Louwala-Clough is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States.

Gifford Pinchot National Forest - Home - US Forest Service

www.fs.usda.gov/giffordpinchot/

Geographically the forest is divided into the Cowlitz Valley Ranger District, the Mount Adams Ranger District, and the Mount St. Helens National Volcanic ...

Geology and History Summary for Mount St. Helens - Volcano ...

volcanoes.usgs.gov/volcanoes/st_helens/st_helens_geo_hist_101.html

Sep 22, 2014 ... USGS: Volcano Hazards Program - Cascades Volcano Observatory USGS Volcano Science Center Mount St. Helens geology and history ...

How did Mount St. Helens form? | Reference.com

www.reference.com/science/did-mount-st-helens-form-988cfdea05e190e6

Mount St. Helens is a cinder cone volcano that formed through the gradual accumulation of cinders and ash at the base of the mountain. Unlike a shield volcano, ...

Mount St. Helens Eruption » The Formation and Eruption of Mount St ...

mountsthelens.web.unc.edu/the-formation-and-eruption-of-mount-st-helens/

The 1980 Mt. Saint Helen's eruption will go down infamously as one of the Nation's ... of every American, and we ask ourselves, Why and how does this happen? ... (Windows to the Universe) The Volcanoes also form in another way out in the ...

Mt. St. Helens History - Mount St. Helens

www.mountsthelens.com/history-1.html

The history of Mt. St. Helens eruption and erupting periods including native ... those of Alaska form the North American segment of the circum-Pacific "Ring of ...

Mount St. Helens Fast Facts - CNN.com

www.cnn.com/2013/07/26/us/mount-st-helens-fast-facts/

May 3, 2016 ... St. Helens Fast Facts on CNN and learn more about the volcano in the ... 6, 2004 - A new lava dome formed inside Mount St. Helens' crater ...

Mount St. Helens Eruption: Facts & Information - Live Science

www.livescience.com/27553-mount-st-helens-eruption.html

Feb 28, 2013 ... Mount St. Helens erupted on May 18, 1980. ... The abrupt release of pressure over the magma chamber created a “nuees ardentes,” a glowing ...