What drew these 1,300 perfect circles on the sea floor? We may finally know.
When hundreds of eerily perfect circles were discovered on the bottom of the Mediterranean Sea, theories abounded about what they could mean. Four years of underwater research revealed a lost world.
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Purpose-driven inventors: Bringing the sea floor to the surface
Even so, little more than 25 percent of the ocean floor has been mapped in detail: We know more about the surface of Mars. This prompted astrophysicist and National Geographic Explorer ...
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10 fascinating facts about the ocean for kids and adults
What are the top facts about the ocean? While much is known about the ocean, a large part of it remains unknown. Here are fun facts about it for people of all ages.
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National Geographic makes it official, Southern Ocean is the fifth ocean
Since National Geographic began making maps in 1915 ... ocean waters to the north Extending from the surface to the ocean floor, the ACC transports more water than any other ocean current.