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  • Environmental Graffiti. "Mother Earth: Water: The Lifeblood of our Planet." (7/30/2010)http://www.environmentalgraffiti.com/ecology/mother-Earth-water-the-lifeblood-of-our-planet/586
  • European Space Agency. "When did liquid water fill the planets?" Jan. 17, 2002. (7/30/2010)http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=29255
  • Lenz, George. "H2O - The Mystery, Art, and Science of Water: The Physics of Water on Earth." Sweet Briar College. (7/30/2010)http://witcombe.sbc.edu/water/physicsEarth.html
  • Muir, Hazel. "Earth's water brewed at home, not in space." NewScientist. Sept. 25, 2007. (7/30/2010)http://www.newscientist.com/article/dn12693
  • NASA. "Earth's Water Probably Didn't Come From Comets." (7/30/2010)http://www2.jpl.nasa.gov/comet/news98.html
  • NASA. "Tests of the Big Bang: The Light Elements." (7/30/2010)http://map.gsfc.nasa.gov/universe/bb_tests_ele.html
  • NASA. "When and how did the elements of life in the Universe arise?" (7/30/2010)http://science.nasa.gov/astrophysics/big-questions/when-and-how-did-the-elements-of-life-in-the-universe-arise/
  • SpaceDaily. "When Did Liquid Water Fill The Planets." Jan. 21, 2002. (7/30/2010)http://www.spacedaily.com/news/early-Earth-02b.html

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