<P> See Clay and Medwin . </P> <P> Applications of acoustical oceanography include: </P> <Ul> <Li> fish population surveys </Li> <Li> classification of fish species and other biota </Li> <Li> rain rate measurement </Li> <Li> wind speed measurement </Li> <Li> water depth measurement </Li> <Li> seabed classification </Li> <Li> ocean acoustic tomography </Li> <Li> global thermometry </Li> <Li> monitoring of ocean - atmospheric gas exchange </Li> </Ul> <Li> fish population surveys </Li>

Can you suggest one application of sound waves in oceanography