The most stable layer in terms of temperature and density is the mixed layer.

Question

Quizplus · Accepted Answer

The mixed layer is subjected to various current and weather conditions that can have influential effects on the water in this layer. The deep zone is the most stable layer in terms of temperature and density. It contains cold, stable water. This layer comprises 80% of all ocean water. Information can be found in the section Surface Water Moderates Global Temperature.

The Most Stable Layer in Terms of Temperature and Density