Discussion
........................... is the level in the ocean where rate of dissolution of carbonate balances the rate of accumulation.
Answer: B
That level is the calcite compensation depth (CCD).
Carbonate shells sinking through the ocean dissolve faster at depth, because cold water under high pressure holds more carbon dioxide. The CCD is the depth at which the rate of dissolution equals the rate at which calcium carbonate is supplied, so below it no carbonate accumulates in the sediment. In today's Pacific it lies at about 4,000 to 5,000 m.
The lysocline lies above the CCD and marks where dissolution first becomes noticeably faster; carbonate still accumulates below it. A transition layer is a general term for a zone of change in the water column, and carbonate critical depth is not the standard name for this balance level.
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