This daily feast-and-famine cycle in oxygen availability created an intense physiological challenge for early animals, ...

Scientists found that volcanic eruptions triggered short-lived oxygen spikes before Earth's air became breathable.

Earth hasn’t always been oxygen-rich. About 2.4 billion years ago ... of the sun and global carbonate-silicate geochemical cycle,” points out Kazumi Ozaki, environmental scientist.

Ancient microbes illustrate a particular kind of respiration in which carbon dioxide and hydrogen are combined to form acetic ...

Scientists think that longer daylight hours allowed cyanobacteria to produce more oxygen ... Earth has been gradually slowing to a spin, transforming frantic six-hour days into the peaceful cycle ...

One biogeochemical cycle that is often overlooked ... In an aqueous or moist environment, exposed to oxygen from Earth's atmosphere, Fe(II) rapidly oxidizes to Fe(III), with a half-life of ...

In about a billion years, Earth will lose its oxygen, making it uninhabitable for life forms that depend on oxygen. The planet will become methane-rich, similar to its state before the Great ...

A study of ancient stromatolites reveals that ammonium reservoirs in early Earth's oceans, likely influenced by volcanic activity, may have supported microbial life before the Great Oxidation Event.

And like plants, they also release oxygen, contributing at least 50 ... and other forms of sea life interact sheds light on Earth’s carbon cycle. Carbon, a chemical element, is found in all ...