<descriptor thcode="61"><thesaurus thcode="61" name="Marine Realms Information Bank (MRIB) keywords" scope="Theme keywords from the former Marine Realms Information Bank, focusing on characteristics of coasts and oceans, processes acting on them, and human concerns about them." creator="U.S. Geological Survey" rights="Public domain" date="2016-09-07" codetype="number" prefix="mrib" tblname="mrib" nonpref="mribnp" relterm="mribrt" root_code="1" contact="aallwardt"><category><term thcode="25" code="27" name="types" parent="26" scope="Terms are types of things rather than named instances"/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="5" name="theme" parent="2" scope="Terms indicate domains of human concern, such as scientific discipline, societal problems, or characteristics of earth, space, oceans, and living things."/><term thcode="25" code="21" name="disciplines" parent="2" scope="Broad categories of human inquiry or activity, such as scientific disciplines."/><term thcode="25" code="20" name="methods" parent="2" scope="Actions taken to obtain or analyze information"/><term thcode="25" code="27" name="types" parent="26" scope="Terms are types of things rather than named instances"/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="5" name="theme" parent="2" scope="Terms indicate domains of human concern, such as scientific discipline, societal problems, or characteristics of earth, space, oceans, and living things."/><term thcode="25" code="21" name="disciplines" parent="2" scope="Broad categories of human inquiry or activity, such as scientific disciplines."/><term thcode="25" code="20" name="methods" parent="2" scope="Actions taken to obtain or analyze information"/></category><altlabel><altlabel>MRIB keywords</altlabel><altlabel>MRIB keywords</altlabel><altlabel>Marine Realms Information Bank keywords</altlabel><altlabel>Marine Realms Information Bank keywords</altlabel></altlabel></thesaurus><term thcode="61" code="258" name="construction" parent="94" scope="used for civil engineering works and other engineered structures."/><bt><term thcode="61" code="94" name="feature type" parent="1"/><term thcode="61" code="1" name="Marine Realms Information Bank (MRIB) keyword categories"/></bt><nt><term thcode="61" code="259" name="breakwater/shoreline stabilization structure" parent="258" scope="a structure that protects the shoreline against erosion by deflecting or dissipating wave energy."/><term thcode="61" code="260" name="bridge" parent="258" scope="a transportation structure that spans a physical obstacle such as a river."/><term thcode="61" code="261" name="canal" parent="258" scope="an artificial waterway for irrigation or transportation."/><term thcode="61" code="262" name="dam" parent="258" scope="a barrier constructed to impound water for domestic use, irrigation, flood control, or hydroelectric power generation."/><term thcode="61" code="263" name="jetty" parent="258" scope="a structure extending into a body of water that deflects or confines currents."/><term thcode="61" code="264" name="levee" parent="258" scope="an embankment constructed along a river or standing body of water to protect adjacent lowlands from flooding."/><term thcode="61" code="265" name="oil well" parent="258" scope="a boring for extracting petroleum."/><term thcode="61" code="266" name="reservoir" parent="258" scope="an artificial lake."/><term thcode="61" code="267" name="water well" parent="258" scope="a boring or excavation for extracting groundwater."/></nt></descriptor>