How Much of the Sea Floor Did Marie End Up Mapping?

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The first comprehensive and accurate map of all the world's oceans was created by marie Lick. She had very limited data, so there was like a lot of gaps to fill in. Back then they could only make really good guesses about what was in those gaps on the sea floor. Now we can really map the sea floor in detail, where we've mapped 20% currently.

Earlier this year, Nicole Yamase explored the bottom of the Challenger Deep, the deepest place in the ocean, where few people have ever been. The rest of the seafloor is almost as mysterious — 80 percent remains unmapped — but the few glimpses scientists have gotten have completely revolutionized our understanding of the planet.

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