Antarctic Arctic Caco, accumulates above CCD Caco, dissolves below CD CCD "Marine snow" 4,500 meters Below CCD, water holds more CO, which results in more carbonic acid, which dissolves CaCO, faster. Figure 5.14 The dashed line shows the calcium carbonate (Caco,) compensation depth (CCD). At this depth, usually about 4,500 meters (14,800 feet), rate at which calcareous sediments accumula equals rate at which those sediments dissolve.

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