Ocean water is layered since cold water is denser that warm water and salt water is denser that fresh

• A. Cold water is denser than warm water
• B. Salt water is denser than fresh water
• C. Both A and B
• D. None of the above

Answer: (C)

Density differences from temperature and salinity create the stacked structure of ocean water. Cold water is denser than warm water, so cooler water tends to sink below warmer water. Similarly, saltier water is denser than freshwater, so higher salinity adds to this sinking tendency. When both effects are present, you get a clear layering: a lighter, warmer, fresher layer near the surface and a heavier, colder, more saline layer below. That’s why both statements are true and together explain why ocean water forms distinct layers.