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ann mulligan working in the field

Subterranean mixing bowl

Ann Mulligan checks groundwater levels and salinity as part of monitoring studies of the saltwater-freshwater interface through time. Between 5 and 10 percent of the fresh water in the ocean comes from groundwater seeping through submarine sediments. Scientists are trying to understand how human activities affect groundwater quality and the coastal ecosystem. (Photo by Tom Kleindinst, Woods Hole Oceanographic Institution)


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