Answer: Deep ocean (or below thermocline)
Explanation:
Most of Earth’s seawater (around 90%) is in the deep ocean, located below the thermocline and pycnocline. The deep ocean´s water is colder and denser than other ocean layers.
Because deep waters are not influenced by the wind, they are non-turbulent and homogenous, meaning they have a constant temperature and salinity from place to place.
