"Why Do Volcanoes Erupt?" Universe Today RSS. N.p., n.d. Web. 17 Jan. 2013.
"How Often Do Volcanoes Erupt? | Volcano World." How Often Do Volcanoes Erupt? | Volcano World. N.p., n.d. Web. 21 Jan. 2013.
"Volcanoes." Volcanoes. N.p., n.d. Web. 22 Jan. 2013.
"How High Can Explosive Eruptions Go and How Far Can the Debris and Ash Be Spread? | Volcano World." How High Can Explosive Eruptions Go and How Far Can the Debris and Ash Be Spread? | Volcano World. N.p., n.d. Web. 22 Jan. 2013.
"MountStHelens.com Information Resource Center & Visitor Guide." MountStHelens.com Information Resource Center & Visitor Guide. N.p., n.d. Web. 24 Jan. 2013.
"Mt. St. Helens." About.com 20th Century History. N.p., n.d. Web. 24 Jan. 2013.
"How We Monitor Volcanoes." How We Monitor Volcanoes. N.p., n.d. Web. 25 Jan. 2013.
"Who Invented The Seismograph?" About.com Inventors. N.p., n.d. Web. 25 Jan. 2013.
"What Tools Do Volcanologists Use to Study Volcanoes? | Volcano World : Supplement."Volcano World Supplement. N.p., n.d. Web. 02 Feb. 2013.
PICTURES
http://ut-images.s3.amazonaws.com/wp-content/uploads/2010/01/JLM-NatGeo-Mount-St-Helens-1980-May-18.jpg
http://www.thelmagazine.com/images/blogimages/2010/03/24/1269440808-volcano.jpg
http://www.boston.com/bigpicture/2010/05/mount_st_helens_30_years_ago.html
"How Often Do Volcanoes Erupt? | Volcano World." How Often Do Volcanoes Erupt? | Volcano World. N.p., n.d. Web. 21 Jan. 2013.
"Volcanoes." Volcanoes. N.p., n.d. Web. 22 Jan. 2013.
"How High Can Explosive Eruptions Go and How Far Can the Debris and Ash Be Spread? | Volcano World." How High Can Explosive Eruptions Go and How Far Can the Debris and Ash Be Spread? | Volcano World. N.p., n.d. Web. 22 Jan. 2013.
"MountStHelens.com Information Resource Center & Visitor Guide." MountStHelens.com Information Resource Center & Visitor Guide. N.p., n.d. Web. 24 Jan. 2013.
"Mt. St. Helens." About.com 20th Century History. N.p., n.d. Web. 24 Jan. 2013.
"How We Monitor Volcanoes." How We Monitor Volcanoes. N.p., n.d. Web. 25 Jan. 2013.
"Who Invented The Seismograph?" About.com Inventors. N.p., n.d. Web. 25 Jan. 2013.
"What Tools Do Volcanologists Use to Study Volcanoes? | Volcano World : Supplement."Volcano World Supplement. N.p., n.d. Web. 02 Feb. 2013.
PICTURES
http://ut-images.s3.amazonaws.com/wp-content/uploads/2010/01/JLM-NatGeo-Mount-St-Helens-1980-May-18.jpg
http://www.thelmagazine.com/images/blogimages/2010/03/24/1269440808-volcano.jpg
http://www.boston.com/bigpicture/2010/05/mount_st_helens_30_years_ago.html