Alphabetical listing of categories: O

oblasts -> political areas (1) field observation -> field inventory and monitoring (375) indicator species observation -> ecosystem monitoring (65) weather observations (50) -> field inventory and monitoring WITH atmospheric and climatic processes observation sites -> research areas (3) geophysical observatories -> science centers (53) observatories -> research facilities (4) radio observatories -> research facilities (4) volcano observatories -> science centers (53) observatorios -> research facilities (4) earthquake occurrence maps (14) -> earthquake occurrences WITH maps and atlases earthquake occurrences (42) ocean-atmosphere interaction (7) ocean bottom characteristics -> sea-floor characteristics (37) ocean characteristics (66) ocean chemistry -> marine chemistry (5) ocean circulation (2) ocean current measurement (2) -> field inventory and monitoring WITH ocean currents ocean currents (1) ocean currents (7) ocean floor features -> seafloor features (15) oceanic lithosphere (4) ocean monitoring (31) -> field inventory and monitoring WITH ocean characteristics biological oceanography -> marine biology (21) chemical oceanography -> marine chemistry (5) geological oceanography -> marine geology (52) oceanography -> ocean sciences (51) physical oceanography -> ocean sciences (51) ocean processes (43) ocean regions (5) oceans (10) oceans (13) -> ocean characteristics WITH ocean processes ocean salinity (2) ocean sciences (51) ocean temperature (12) ocean tides -> tides (oceanic) (5) ocean water quality -> marine water quality (14) ocean wave measurement (3) -> field inventory and monitoring WITH ocean waves ocean waves (20) distribution of animals -> biogeography (69) effects of climate change (31) off-stream water use -> offstream water use (16) field offices (8) offices -> buildings (12) regional offices (1) science discipline offices (3) support offices (2) official communications (19) offshore areas -> coastal zones (76) offstream water use (16) distribution of plants -> biogeography (69) lists of publications -> catalogs and indexes (98) improvement of scientific data usability (1) distribution of species -> biogeography (69) collection of specimens -> specimen collecting (20) bodies of water -> hydrographic features (260) sounds (bodies of water) -> channels (4) OGC WCS -> web map services (6) OGC WFS -> web map services (6) OGC WMS -> web map services (6) oil fields (1) oilfields -> oil fields (1) olive oil mills -> industrial sites (2) oil palm plantations -> agricultural sites (5) enhanced oil recovery (4) tertiary oil recovery -> enhanced oil recovery (4) oil refineries -> industrial sites (2) oil resources (81) oil shale resources (6) oil spills (10) -> industrial pollution WITH petroleum oil wells -> wells (27) olive groves -> woods (1) olive oil mills -> industrial sites (2) maps on demand -> sales and distribution services (15) ontogeny -> organism growth and development (8) ontology development -> knowledge organization system development (2) open pit mines -> mine sites (15) employment and volunteer opportunities (12) optical backscatterance sensing -> optical methods (3) optically-stimulated luminescence dating -> luminescence dating (3) optical methods (3) optical microscopy (2) optical reflectance measurement -> optical methods (3) oral presentations -> speeches and testimony (1) orchards -> agricultural sites (5) countries, 2nd order divisions (1) ore deposits (metallic) -> metallic ores (23) ore deposits (non-metallic) -> nonmetallic mineral resources (12) ore formation (1) metallic ores (23) ore treatment plants -> industrial sites (2) dissolved organic compounds (6) organic decomposition -> biogeochemical cycling (13) organism groupings (non-taxonomic) (195) organism growth and development (8) biological organisms -> organisms (300) genetically engineered organisms (1) genetically modified organisms -> genetically engineered organisms (1) organisms (300) organizational structure (66) knowledge organization system development (2) orienteering -> geolocation measurement (39) ornithology (32) orthoimagery (18) -> image collections WITH aerial photography orthophotographs (18) -> image collections WITH aerial photography Ostracoda -> ostracodes (1) ostracodes (1) ostracods -> ostracodes (1) outer core (earth) (1) outfall -> contamination and pollution (167) over-fishing -> overfishing (3) over-grazing -> overgrazing (1) overfalls -> hydrographic features (260) overfishing (3) overgrazing (1) overpasses -> bridges (2) intermittent oxbow lakes -> lakes (33) oxbow lakes -> lakes (33) dissolved oxygen -> oxygen content (water) (12) oxygen content (water) (12) oxygen isotope analysis (6) ozone layer (1) ozonesphere -> ozone layer (1)

Alphabetical index of categories: O