We can map the bottom of the sea. 
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🖼️ Images & Media (8)
Mid-ocean ridge system.gif
Draining the Oceans video by NASA.webm
Map_of_ocean_floor_based_on_earths_gravity...
Rear map.jpg
Atlantic-trench.JPG
AYool topography 15min.png
Earth_dry_elevation.stl
Echo Sounding of Newly Discovered Canyon...
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Content adapted from Wikipedia
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Readability: FK 13.9
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Vital Level 5