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The absorption, or uptake, of anthropogenic CO2 by the oceans results in a decrease in pH and carbonate ion concentration, [CO32−]; as a consequence, the saturation state of seawater with respect to CaCO3 minerals (calcite, aragonite) falls, leading to a shallowing of their saturation depths and triggering an increase in their dissolution at the seafloor. Nearly one-third of the seabed is composed...