Geochemical cycles of elements and human perturbation

The pollution inputs of various elements are omnipresent in aerosols, snows, rivers and the ocean of the northern hemisphere. The mid-ocean ridges are not important sinks or sources for most of the elements. The settling of fecal pellets is the predominant transport mechanism of most elements (except Mn, Co and Ni) from the surface to deep oceans. Dissolved Mn, Co and Ni are directly incorporated into pelagic clays at the sediment water interface.