Some rocks contain molecules that could have formed only in the presence of oxygen. ... When they look at the oldest rocks on earth, they find no trace of oxygen in the atmosphere. Instead, their research indicates that earth's primordial air was made up mostly of carbon dioxide, methane and Nitrogen
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Some rocks contain molecules that could have formed only in the presence of oxygen. ... When they look at the oldest rocks on earth, they find no trace of oxygen in the atmosphere. Instead, their research indicates that earth's primordial air was made up mostly of carbon dioxide, methane and Nitrogen