Manganese oxides are thought to be a signature of atmospheric oxygen. But on the Red Planet, recent results suggest they might be more of a red herring.
The relative abundance of different oxidation states for this important micronutrient varies on the basis of how much available sunlight there is.
A new study explores a possible proxy for seasonal freshwater input that could elucidate changes in alpine snowpack as the planet warms.
Microbes living in the sand on a barrier island alter the way they break down organic matter as their environment changes throughout the year, which has implications for the surrounding water column.
Legacy heavy metals from past industrial activity combine with traffic paint; asphalt; and bits of tires, brakes, and car parts to create toxic dust on our roadways.
Manganese deposits in Gale Crater fractures are similar to Earth features that usually require flowing water and highly oxidizing conditions.
Data from the Curiosity rover suggest that the surface of Mars has experienced more strongly oxidizing conditions than previously thought.