So what changed, and how did it happen? The scientific consensus is that about 2.5 billion years ago, the Great Oxygenation Event (GOE) took place, most likely due to a proliferation of ...

So what changed, and how did it happen? The scientific consensus is that about 2.5 billion years ago, the Great Oxygenation Event (GOE) took place, most likely due to a proliferation of ...

setting the stage for the Great Oxygenation Event (GOE). Today, Earth’s atmosphere is composed of approximately 21% oxygen, but this has not always been the case. More than 2.5 billion years ago ...

Thanks to a multitude of occurrences, like whiffs and mass extinction events, microorganisms capable of performing photosynthesis had the necessary atmosphere to grow rapidly and increase their oxygen ...

A conceptual rendering suggests how Earth's land elevations and oceans may have appeared during the assembly of Kenorland, left, and later, right, after the Great Oxygenation Event. A University ...