<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="297" name="pollution" parent="269" scope="used for the effects of toxins and other pollutants on ecosystems."/><uf><usefor name="contamination and pollution"/></uf><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="298" name="bacterial digestion of pollutants" parent="297" scope="the removal and stabilization of pollutants from an ecosystem by bacteria."/><term thcode="61" code="299" name="concentration of pollutants in the food chain" parent="297" scope="the incremental accumulation of pollutants in a food chain, with toxins becoming concentrated at the higher levels."/><term thcode="61" code="300" name="heavy metal pollution" parent="297" scope="the behavior and effects of heavy metals on natural environments."/><term thcode="61" code="301" name="impacts of pollution on public health" parent="297" scope="the sources and characteristics of environmental pollutants as they relate to human health."/><term thcode="61" code="302" name="inorganic pollutants" parent="297" scope="the behavior and effects of inorganic pollutants on natural environments."/><term thcode="61" code="303" name="nutrient pollution" parent="297" scope="the behavior, sources, and effects of excess nutrients such as nitrogen and phosphorus compounds on natural environments."/><term thcode="61" code="304" name="organic pollutants" parent="297" scope="the interaction, sources, and impacts of anthropogenic organic chemicals on natural environments."/><term thcode="61" code="305" name="pollutants in runoff" parent="297" scope="the effects of agricultural, industrial, and other pollutants in drainage."/><term thcode="61" code="306" name="radioactive waste" parent="297" scope="the sources, movement, and impacts of radioactive pollutants on the environment."/><term thcode="61" code="307" name="sediment-pollutant interaction" parent="297" scope="the trapping, transport, and release of pollutants as they interact with sediments."/></nt><rt><term thcode="61" code="352" name="spills" parent="323" scope="unintended release of a toxin or pollutant during transport, processing, or use."/></rt></descriptor>