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In the mid-20th century, when people looked at a map of the world, they saw the familiar continents surrounded by vast, featureless oceans. Beneath the waves, the ocean floor was largely unknown — an uncharted territory, hidden from view. That all changed thanks to the work of Marie Tharp.
https://www.zmescience.com/other/geopicture/atlantic-ridge-geology-repubz/
Oil rendition of Marie's ocean data
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