<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="288" name="habitats" parent="269" scope="environments discussed in relation to the organisms they support."/><bt><term thcode="61" code="269" name="environment" parent="268" scope="used for issues related to the interactions of humans or other organisms with their physical and biological surroundings."/><term thcode="61" code="268" name="hot topics" parent="1"/><term thcode="61" code="1" name="Marine Realms Information Bank (MRIB) keyword categories"/></bt><nt><term thcode="61" code="289" name="human impacts on habitats" parent="288" scope="the effects of human activities on habitats."/><term thcode="61" code="290" name="hydrologic characteristics of habitats" parent="288" scope="used for all types of currents and waves -- in oceans, lakes, and streams -- and their effects on aquatic habitats."/><term thcode="61" code="291" name="mercury cycle" parent="288" scope="the movement of mercury -- a component of some cumulative neurotoxins -- through biological, geological, hydrological, and atmospheric systems."/><term thcode="61" code="292" name="nutrient cycle" parent="288" scope="the cycling of nutrients such as nitrogen and phosphorus compounds through biological, geological, hydrological, and atmospheric systems."/><term thcode="61" code="293" name="physical and chemical characteristics of habitats" parent="288" scope="used for substrate character and other physical or chemical controls on habitats."/><term thcode="61" code="294" name="spatial characteristics of habitats" parent="288" scope="used for habitat fragmentation, habitat connectivity, and other spatial controls on habitats."/><term thcode="61" code="295" name="water cycle" parent="288" scope="the movement of water through the subsurface, terrestrial water bodies, ocean, atmosphere, and organisms."/><term thcode="61" code="296" name="weather effects on habitats" parent="288" scope="weather and changes in weather as they relate to ecosystems."/></nt></descriptor>