USGS water resources/watershed regions map are shown. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for ...
Chloride and nitrate concentrations are rising and arsenic levels are holding steady or falling. Those are two of the conclusions from a U.S. Geological Survey assessment of changes in the nation’s ...
Every bird, fish and bear knows that rivers don’t stop at an international boundary, but it’s taken awhile to convince human governments of that fact. Now the U.S. Geological Survey has released a ...
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