hints

Where does Earth's oxygen come from?  A new study hints at an unexpected source

Where does Earth’s oxygen come from? A new study hints at an unexpected source

The amount of oxygen in Earth’s atmosphere makes it a habitable planet. Twenty-one percent of the atmosphere is made up of this life-giving element. But in the distant past – as far back as the Neoarchean era 2.8 to 2.5 billion years ago – this oxygen was almost absent. So how did the Earth’s atmosphere …

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Where does Earth's oxygen come from?  A new study hints at an unexpected source

Where does Earth’s oxygen come from? A new study hints at an unexpected source

2750-2670 million year old granitoid rocks collected from the largest preserved Archean continent could help reveal the origin of Earth’s oxygen. Credit: Dylan McKevitt, author provided The amount of oxygen in Earth’s atmosphere makes it a habitable planet. Twenty-one percent of the atmosphere is made up of this life-giving element. But in the distant past …

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