TheAdmiralMoses t1_iy2q36v wrote
Reply to comment by PoorlyAttired in TIL More than 80 percent of the ocean has never been mapped, explored, or even seen by humans and as a result, we know more about the surface of Mars than Earth by [deleted]
Not exactly, I believe those are mostly extrapolation based off of the known depths, scanning ships go along major routes and scan the sea floor to measure it directly, but they don't know more remote areas, which is 70% of the ocean.
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