Thermoclines!

= Thermocline: =

Every ocean has a thermocline. The thermocline is an area of the ocean in which temperatures change rapidly, from hot to cold or vise versa. One main reason why this occurs is because the sun doesn't directly hit the ocean floor and heat it. As depth increases, temperature decreases due to the amout of sunlight that reaches that area. The thermocline is found near the surface of the ocean. Water near the surface is less dense when the sunlight heats the surface of the water. The thermocline is a good way to determine how far deep a scuba diver is to to the bottom of the ocean. If you feel a great decrease of temperature, you are obviously close to the bottom. In other words, the thermocline is just a separation of "warm surface water and cold deep ocean water".