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Earth’s Changing Surface. N.p.: Pearson, 2009. Print.
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“Geologic Time-Enchanted.” EnchantedLearning.com. N.p., 1997. Web. 17 Nov. 2014.
Geologic Time Scale. N.p., 6 Jan. 2006. Web. 11 Nov. 2014.
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“The Geologic Time Scale.” Science Views. Calvin and Rosanna Hamilton, 2003. Web. 5 Dec. 2014.
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