This surface layer is also called the sunlight zone and extends from the surface to 200 meters. Most visible light exists in this zone. All of this light creates a lot of heat, and is also responsible for the wide range of temperature changes in this zone.

This zone is sometimes referred to as the twilight zone or the midwater zone, as the sunlight here is now very faint. The weakness of the light also means that the temperature begins to change dramatically here. In this zone, you'll also start to see bioluminescence appear on lifeforms.

The depths between 1000 and 4000 meters are known as the bathypelagic zone. All of the sunlight is gone now. It is for this reason that this zone is also known as the midnight zone. The temperature here is a constant 39°F (4°C)

The abyssal zone is the pitch-black bottom layer of the ocean. The waters here are constantly near freezing and there are very few creatures to be found.

The Hadalpelagic zone is the deepest part of the ocean. It extends from the ocean floor down into the deepest trenches of the Earth's crust.