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Seawater along the coastline is diluted by freshwater and contains the radioactive isotope radium 226, which erodes off sediment encountered by rivers and groundwater. Since the radium concentrations in rivers are well established, unusually high radium levels in coastal waters indicated to Moore that there had to be another source of freshwater. To determine just how much groundwater was flowing into the ocean, Moore examined the chemistry of the freshwater entering the ocean along 200 miles of the South Carolina coast.

diluted = mixed                             concentrations = density
erodes = wears away                    determine = figure out
encountered = met

Click True or False:

Moore believed that oceans had another source of freshwater besides rivers because he found low concentrations of radium in coastal waters.