The Earth may have had an oxygen-rich atmosphere as long ago as three billion years and possibly even earlier, three leading geologists have claimed. Their theory challenges long-held ideas about when the Earth’s atmosphere became enriched with oxygen, and pushes the likely date for formation of an atmosphere resembling today’s far back into the early history of the planet.
The above story is based on materials provided by CSIRO Australia. Note: Materials may be edited for content and length.
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CSIRO Australia. "Primordial Air May Have Been "Breathable"." ScienceDaily. ScienceDaily, 9 January 2002. <www.sciencedaily.com/releases/2002/01/020109074039.htm>.
CSIRO Australia. (2002, January 9). Primordial Air May Have Been "Breathable". ScienceDaily. Retrieved April 21, 2014 from www.sciencedaily.com/releases/2002/01/020109074039.htm
CSIRO Australia. "Primordial Air May Have Been "Breathable"." ScienceDaily. www.sciencedaily.com/releases/2002/01/020109074039.htm (accessed April 21, 2014).