<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="711" name="geology" parent="639" scope="the study of the Earth's structure, composition, past and present processes, and history."/><bt><term thcode="61" code="639" name="discipline" parent="1"/><term thcode="61" code="1" name="Marine Realms Information Bank (MRIB) keyword categories"/></bt><nt><term thcode="61" code="712" name="economic geology" parent="711" scope="studies of the origin and distribution of metallic, nonmetallic, and energy resources."/><term thcode="61" code="714" name="engineering geology" parent="711" scope="the application of geologic principles to problems in civil engineering."/><term thcode="61" code="715" name="environmental geology" parent="711" scope="the application of geologic principles to environmental problems."/><term thcode="61" code="716" name="geomorphology" parent="711" scope="the study of landforms and their evolution."/><term thcode="61" code="717" name="historical geology" parent="711" scope="the study of earth history, generally focusing on changes at the Earth's surface."/><term thcode="61" code="718" name="hydrogeology" parent="711" scope="the study of geologic controls on groundwater distribution and movement."/><term thcode="61" code="719" name="marine geology" parent="711" scope="used for geological and related studies of ocean basins and margins."/><term thcode="61" code="720" name="mineralogy" parent="711" scope="the study of the chemistry, crystalline structure, and physical properties of minerals."/><term thcode="61" code="721" name="paleontology" parent="711" scope="the study of ancient life and evolutionary history from a geological perspective."/><term thcode="61" code="724" name="petrology" parent="711" scope="the study of the composition, structure, and origin of rocks."/><term thcode="61" code="725" name="planetary geology" parent="711" scope="the application of geologic principles to the study of planetary bodies."/><term thcode="61" code="726" name="sedimentology" parent="711" scope="the study of sediments, sedimentary processes, and the origin of sedimentary rocks."/><term thcode="61" code="727" name="soil science" parent="711" scope="the study of soils and soil-forming processes"/><term thcode="61" code="728" name="stratigraphy" parent="711" scope="the study of layered sedimentary and volcanic rocks."/><term thcode="61" code="730" name="structural geology" parent="711" scope="the study of the structural features of rock units, usually to establish their deformational histories."/><term thcode="61" code="731" name="tectonics" parent="711" scope="the study of the nature and origin of the broad structural features of the Earth's crust."/><term thcode="61" code="733" name="volcanology" parent="711" scope="the study of volcanoes and their eruptive products."/></nt><rt><term thcode="61" code="428" name="geologic mapping" parent="427" scope="the collection and synthesis of field observations to determine the distribution, structure, and age of earth materials in a study area."/></rt></descriptor>