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    <skos:prefLabel xml:lang="en">TIDES</skos:prefLabel>
    <gcmd:reference gcmd:text="Adapted from: Garrison, T., 1993, Oceanography, An Invitation to Marine Science, Wadsworth Publishing Co., p. 528.    Neshyba, S., 1987, Oceanography, Perspectives on a Fluid Earth, John Wiley and Sons, Inc., p. 490." xml:lang="en"/>
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    <skos:definition xml:lang="en">Pertaining to the study of the periodic rise and fall of the seasurface, generated by long-wavelength waves which are caused by theinteraction of gravitational force and inertia.  Variables includecharacteristics of tides and other aspects important to their study.</skos:definition>
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