Want an oxygen-rich atmosphere? Stuff oxygen’s friends in the mantle.
Planet Earth has some pretty great qualities going for it. (Negative reviews mostly revolve around the staff and clientele.) Pretty high on the list of positives is a richly oxygenated atmosphere. But that’s something that evolved and built up over a couple billion years, only eventually resulting in a world conducive to animal life like us. Scientists have many ideas about what could have caused oxygen to increase, and it seems that a number of them are probably […]