The article discusses various aspects of metal transport and bioavailability in different environments, including oceans, freshwater, and terrestrial ecosystems. It explores the uptake of heavy metals by plants and cyanobacteria, as well as the presence of arsenic in groundwater. The impact of human activities on the cycling of metals like antimony is also examined. Additionally, the study delves into the microbial transformations of radionuclides and the role of carbonates in recording past climates.