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EvolutionaryBiology. "National Geographic - How Volcanoes Form." Youtube. National Geographics, 30 Apr. 2009. Web. 13 May 2013.
"How Do Volcanoes Affect the Atmosphere and Climate? | Volcano World." How Do Volcanoes Affect the Atmosphere and Climate? | Volcano World. Oregon State Grant University, n.d. Web. 14 May 2013.
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Myandyourutube. "How Volcanoes Formed." YouTube. YouTube, 22 June 2011. Web. 14 May 2013.
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Random Facts. "45 Amazing Facts About . . . Var Addthis_config = {"services_compact":"stumbleupon,reddit,google_plusone_share,tumblr,fark,digg,delicious,linkedin", "services_expanded":"stumbleupon,reddit,google_plusone_share,fark,tumblr,digg,delicious,linkedin"};." 45 Amazing Facts about Earth. N.p., 2007-2013. Web. 14 May 2013.
"What Is the Troposphere?" Weather Questions. N.p., 11 Nov. 2010. Web. 14 May 2013.
CBSNewsOnline. "Volcano Could Impact Climate." Youtube. Cbsnews.com, 17 Apr. 2010. Web. 10 May 2013.
"The Crust." The Earths Layers. N.p., n.d. Web. 12 May 2013.
EvolutionaryBiology. "National Geographic - How Volcanoes Form." Youtube. National Geographics, 30 Apr. 2009. Web. 13 May 2013.
"How Do Volcanoes Affect the Atmosphere and Climate? | Volcano World." How Do Volcanoes Affect the Atmosphere and Climate? | Volcano World. Oregon State Grant University, n.d. Web. 14 May 2013.
"Mantle." - National Geographic Education. N.p., 1996–201. Web. 14 May 2013.
Myandyourutube. "How Volcanoes Formed." YouTube. YouTube, 22 June 2011. Web. 14 May 2013.
Myandyourutube. "How Volcanoes Formed." YouTube. YouTube, 22 June 2011. Web. 14 May 2013.
Random Facts. "45 Amazing Facts About . . . Var Addthis_config = {"services_compact":"stumbleupon,reddit,google_plusone_share,tumblr,fark,digg,delicious,linkedin", "services_expanded":"stumbleupon,reddit,google_plusone_share,fark,tumblr,digg,delicious,linkedin"};." 45 Amazing Facts about Earth. N.p., 2007-2013. Web. 14 May 2013.
"What Is the Troposphere?" Weather Questions. N.p., 11 Nov. 2010. Web. 14 May 2013.