<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="227" name="biological features" parent="94" scope="used for distinctive biological phenomena or communities of organisms."/><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="228" name="beach zone communities" parent="227" scope="used for communities of organisms characteristic of beach habitats in the supratidal, intertidal, and shallow subtidal zones."/><term thcode="61" code="231" name="benthos" parent="227" scope="used for communities of organisms characteristic of sea-floor habitats."/><term thcode="61" code="232" name="coral reef communities" parent="227" scope="used for communities of organisms characteristic of coral reef habitats."/><term thcode="61" code="233" name="feeding furrows" parent="227" scope="sea-floor grooves or trenches created by bottom-feeding whales."/><term thcode="61" code="234" name="forest" parent="227" scope="a terrestrial community dominated by trees."/><term thcode="61" code="235" name="kelp forest" parent="227" scope="shallow marine community dominated by kelp."/><term thcode="61" code="239" name="nekton and plankton" parent="227" scope="communities of organisms that populate the water column."/><term thcode="61" code="236" name="peat bog" parent="227" scope="a wetland characterized by a thick accumulation of peat (partially decayed vegetation, commonly moss)."/><term thcode="61" code="237" name="prairie" parent="227" scope="used for grassland plains and savannas."/><term thcode="61" code="238" name="tundra" parent="227" scope="used for arctic tundra and alpine tundra: treeless areas characterized by low temperatures and/or short growing seasons."/></nt></descriptor>