If the gradual rise of deep water at temperate and tropical zones were to stop, the thermocline would rise, making the difference in water layers steeper.

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The thermocline would sink if the deep water did not rise in the temperate and tropical zones. This would make the layering in the water less steep. The thermocline maintains its position by the continual slow upward movement of water. Information can be found in the section Thermohaline Circulation Affects All the Ocean's Water.

If the Gradual Rise of Deep Water at Temperate and Tropical