Bibliography: Bureau of Labor Statistics. 12 November 2010 <http://www.bls.gov/oco/cg/cgs003.htm>. Global Climate Change Facts. 11 November 2010 <http://www.climatechangefacts.info/#Fact>. WikiPedia. 12 November 2010 <http://en.wikipedia.org/wiki/Age_of_the_Earth>.
Bibliography: Bureau of Labor Statistics. 12 November 2010 <http://www.bls.gov/oco/cg/cgs003.htm>. Global Climate Change Facts. 11 November 2010 <http://www.climatechangefacts.info/#Fact>. WikiPedia. 12 November 2010 <http://en.wikipedia.org/wiki/Age_of_the_Earth>.