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Alden, Andrew. "Birth of The Earth." About.com Geology. The New York Times Company. Web. 25 Apr. 2012. <http://geology.about.com/od/nutshells/a/aa_earthbirth.htm>.

Exline, Ed.D, Joseph D. Science Explorer: Earth's Changing Surface. Upper Saddle River :New Jersey: Prentice Hall, 2000. Print.


"Prehistoric Time Line." National Geographic. National Geographic. Web. 25 Apr. 2012. .

"The Era of Fossil Fuel Energy Sources." Fossil Fuel Technologies. David W. Koeller, 1996. Web. 26 Apr. 2012. .

ashfield, Jean F., and Richard P. Jacobs. When Land, Sea, and Life Began: The Precambrian. Chicago: Heinemann Library, 2006. Print.

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