The place where land and ocean meet is known as the coastal zone. All your favorite beaches, rocky outcroppings, bays, and inlets are a part of this zone. In this area, you can find tide pools full of sea anenomes, urchins, small fish, little crabs, and a variety of mollusks. You can also find playful seals and otters here, as well as different types of sea birds.
Located near the surface of the ocean, the epipelagic zone receives more sunlight than any other part of the sea. It is home to the algae that conduct photosynthesis, responsible for about 50% of the Earth's oxygen. This section of the ocean extends from the surface to about 200m below sea level. In this area, you can find coral reefs, dolphins, colorful fish, and stingrays.
The mesopelagic zone is the second part of the ocean. Some sunlight reaches this zone, but by the time it ends (1000m below sea level) sunlight can no longer penetrate its depths. Larger than the epipelagic, there are countless creatures that live in the mesopelagic zone. Many of these creatures shift between the epipelagic and mesopelagic, dwelling in the depths during the day and coming to feed in the sunlit zone at night. In this area, you can find different types of sharks and fish.
The bathypelagic zone, also known as the midnight zone, is the largest zone in the ocean and completely hidden from sunlight. This part of the sea stretches to 4000m below sea level and most of its creatures have bioluminescent properties. In the darkness, you can find special species of octopi and squid, as well as some hardy crustaceans and jellyfish.
Finally, the last most common zone in the ocean is the abyssopelagic zone...the abyss. While it is difficult for anything to live at this depth (stretching to the bottom of the ocean), some creatures are able to brave the unknown. Here, you can find some strange looking creatures such as anglerfish, some types of squid and octopi, tubeworms (which hang around hydrothermal vents), and different types of shrimp.