Respuesta :
The correct answer is Thermocline.
The ocean is majorly divided into 3 main layers on the basis of temperature. The sun heats up the upper layer of water of the ocean and so it is called a warm layer.
The sunlight does not reaches deep inside the water called as the deep layer in which the temperature of water is low and it is cold.
These two layers are separated by the middle layer called as the thermocline, which is warm at the top and cold at the bottom.
