How can we conclude that “Challenger Deep” is the deepest part of the ocean. Does that mean we have explored all parts of the ocean?
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It’s a question of feature size. Different technologies are used for viewing the ocean floor, with some able to get better coverage at lower resolutions, and some with less coverage but at higher resolutions. Most of the seafloor has been mapped to a low resolution (several kilometers) which is useful for finding the deepest spot. Theoretically there could be a crack that’s only a few meters wide and deeper than challenger deep and we wouldn’t know about it.
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