Can you provide an explanation for the difference in depth at which sharp reductions in calcium carbonate occur in Ocean A and in Ocean B?

(b) The sharp reduction in calcium carbonate below a depth of about 4000 meters in ocean A is due to increase carbonate dissolution. Carbonate dissolution results from the corrosiveness of seawater, which increases as temperature decreases, pressure increases and carbonate-ion content decreases.

Explanation:

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imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.