Beyond the shore and reefs, this zone is characterized by a mixing of cold and warm ocean currents. The pelagic zone begins further out into the sea and is essentially the open ocean. Intertidal zones are home to algae and sea plants as well as familiar species of starfish, crabs, snails and small fish. As waves and tides flow in and out, these areas are sometimes exposed to the open air and sometimes submerged by sea water. These zones are points where the ocean meets the land – more commonly known as simply the seashore. The intertidal zone is the area that divers and biologists are most familiar with. Each zone is characterized by a vast array of beautiful and sometimes eerie sea life. Each ocean biome is also subdivided into zones based on the water’s depth. The biomes of the ocean are as varied and diverse as those found on land. Much of the world’s oxygen supply comes from a variety algae growing throughout the ocean ecosystem. Though the ocean floor still remains in large part a mystery, the marine biome covers almost 70% of the Earth’s surface. The marine biome is the largest, and perhaps the most important ecosystem on Earth.
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