What's at the bottom of the Mariana Trench, and how do we know? How deep does the ocean go? We'll answer these questions and more in this deep dive into the world's oceans. Come on in: The water's ...
The ocean covers more than 70 percent of the Earth's surface. Considering how vast it is, scientists know relatively little about what's going on down there. On top of that, there are many popular ...
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