Ancient sediments that once resided on a lake bed and the ocean floor show sulfur isotope ratios unlike those found in other samples from the same time, calling into question accepted ideas about when ...

Sedimentary rocks created more than 2.4 billion years ago sometimes have an unusual sulfur isotope composition thought to be caused by the action of ultra violet light on volcanically produced sulfur ...

The provenance of oxygen (O 2) has been linked to the early Earth's atmospheric and biological evolution. A permanent rise to appreciable concentrations of O 2 in the atmosphere, known as the "Great ...

Sulfur oxides (SO x) have several harmful effects both to the environment, and to human and animal health. Much of the SO x in the atmosphere comes from the burning of fossil fuels by power plants and ...