Water temperature gives a clue as to what ocean layer the water belongs to by revealing that: "The temperature of surface water is higher than the temperature of deep water."
- This is because the surface water is more exposed to sunlight, this generally gets warmer than the deep water.
- Also, because of fewer sunlight rays on the deep water, it gets colder and denser.
- Generally, the water surface has three layers, including surface layer, deep water layer, and seafloor layer where chemosynthesis occurs due to no light penetration.
Hence, in this case, the correct answer is option A "The temperature of surface water is higher than the temperature of deep water."
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