front a boundary between two water masses with differing properties such as temperature and salinity Related Articles: Glossary: phocids or true sealsGlossary: pitchGlacial Calving in the Arctic Produces Record Source LevelsAbout DOSITSDr. MillerForward Looking SonarIceberg CollisionsHooded SealHow does sound travel in shallow water? Chris Knowlton2017-10-19T12:47:54-05:00