Bathymetric data also relies on the collection and study of sediment cores. Here, Symons poses with a sediment core that has recorded the shifting composition of the seafloor over thousands of years.

Photograph by Jan Craven, courtesy Christina Symons
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Dr. Christina Symons not only describes her work mapping the seafloor but she also explains how all ocean geologists work to uncover what lies under our world’s oceans.