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The amount of oxygen in the Earth's atmosphere makes it a habitable planet. 21% of the atmosphere consists of this life-giving element. But in the deep past - as far back as the Neoarchean era 2.8-2.5 billion years ago - this oxygen was almost absent ....
Where did the Earth's oxygen come from? New study hints at an unexpected source australasianscience.com.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from australasianscience.com.au Daily Mail and Mail on Sunday newspapers.