Abstract
Abstract Calcium is present in igneous rocks to the extent of about 3.6 per cent. The exchange complex of most soils carries comparatively large quantities of calcium but the geologic trend at present is a net movement of calcium from the continental shields to the continental shelves, and hemipelagic and pelagic sediments. There is a continual return by oceanic circulation to shelf and hemipelagic zones and a small return to land by oceanic spray generated aerosols. A universal requirement of plants and animals for calcium figures strongly in oceanic cycling and the influence of plants and microorganisms on the carbonic acid‐carbonate system modulates its terrestrial mobility.
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