![]() A far greater percentage of the surfaces of the moon and the planet Mars has been mapped and studied than of our own ocean floor.Īlthough there is much more to learn, oceanographers have already made some amazing discoveries. More than 80 percent of the ocean has never been mapped, explored, or even seen by humans. Despite its size and impact on the lives of every organism on Earth, the ocean remains a mystery. Because of this, the ocean has considerable impact on weather, temperature, and the food supply of humans and other organisms. ![]() Beginning in the 20th century, some oceanographers labeled the seas around Antarctica the Southern Ocean, and in 2021 National Geographic officially recognized this fifth ocean.Īn estimated 97 percent of the world’s water is found in the ocean. ![]() The planet has one global ocean, though oceanographers and the countries of the world have traditionally divided it into four distinct regions: the Pacific, Atlantic, Indian, and Arctic oceans. The ocean is a huge body of saltwater that covers about 71 percent of Earth’s surface. ![]()
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