Denver, Colo. -- Increasing amounts of oxygen in the atmosphere could have triggered the first of three past episodes when the Earth became a giant snowball, covered from pole to pole by ice and frozen oceans, according to a Penn State researcher.
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Penn State. "Oxygen May Be Cause Of First Snowball Earth." ScienceDaily. ScienceDaily, 29 October 1999. <www.sciencedaily.com/releases/1999/10/991029071656.htm>.
Penn State. (1999, October 29). Oxygen May Be Cause Of First Snowball Earth. ScienceDaily. Retrieved April 23, 2014 from www.sciencedaily.com/releases/1999/10/991029071656.htm
Penn State. "Oxygen May Be Cause Of First Snowball Earth." ScienceDaily. www.sciencedaily.com/releases/1999/10/991029071656.htm (accessed April 23, 2014).