<descriptor thcode="62"><thesaurus thcode="62" name="Coastal and Marine Ecological Classification Standard" scope="Categories of ecosystems for coastal, estuarine, and marine environments." creator="FGDC" rights="public domain" date="2017-05-10" codetype="alpha" prefix="cmecs" uri="https://www2.usgs.gov/science/CMECS" tblname="cmecs" root_code="root" contact="pschweitzer"><category><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/></category><altlabel><altlabel>CMECS</altlabel><altlabel>CMECS</altlabel><altlabel>Coastal and Marine Ecological Classification Standard (CMECS)</altlabel><altlabel>Coastal and Marine Ecological Classification Standard (CMECS)</altlabel></altlabel></thesaurus><term thcode="62" code="WC-C012" name="Hydroform" parent="WC-C001"/><bt><term thcode="62" code="WC-C001" name="Water Column" parent="root"/><term thcode="62" code="root" name="CMECS" scope="Coastal and Marine Ecological Classification Standard: Category terms encompassing waters from the head of tide or inland incursion of ocean salinity to the splash zone of the coasts to the deepest portions of the oceans and the deep waters of the Great Lakes."/></bt><nt><term thcode="62" code="WC-627" name="Current" parent="WC-C012" scope="Hydroform Class: Water that is undergoing coherent mass movement, either as laminar or turbulent flow, relative to surrounding waters and fixed structural, landform or geologic features. ..."/><term thcode="62" code="WC-670" name="Front" parent="WC-C012" scope="Hydroform Class: Front Hydroforms are linear features formed at the conjunction of two or more water masses with different properties. ..."/><term thcode="62" code="WC-674" name="Water Mass" parent="WC-C012" scope="Hydroform Class: The Water Mass Hydroform Class refers to a parcel of water with homogeneous properties (e.g., chemical, physical). ..."/><term thcode="62" code="WC-683" name="Wave" parent="WC-C012" scope="Hydroform Class: The Wave Hydroform Class is a propagation of energy that moves through the water, causing a vertical, oscillatory motion with characteristic wavelength, amplitude, and celerity. ..."/></nt></descriptor>