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HONOLULU (AP) - Rain falling on the surface of the ocean can be heard more than a mile deep, and at some frequencies it's louder than passing ships, according to oceanographer Jeff Nystuen.
Nystuen, of the Applied Physics Laboratory at the University of Washington, is one among scientists studying how sound travels through the ocean, to better understand how loud, man-made noises might affect marine creatures.
"We don't really know what is too loud underwater, and we need to know what the baseline is," Nystuen said.
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