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Geography

How the Ocean Surface Mirrors the Seafloor

Quick fact

A seamount can make the ocean surface bulge upward by about 1 to 2 meters, while a deep ocean trench can cause a depression of a similar amount—features that are invisible to the eye but detectable by satellites.

Why this is interesting

You probably think of the ocean as a flat, rolling expanse of water. But beneath your boat, the surface is quietly bulging and dipping, mimicking mountains and trenches miles below.