administrative facilities -> buildings (9) adminstrative facilities -> buildings (9) conference facilities -> buildings (9) facilities (2) facilities -> buildings (9) transit facilities -> transportation features (1) facility centers -> buildings (9) factories -> industrial sites (9) earthquake-triggered ground failure -> ground failure (1) ground failure (1) tank farms -> industrial sites (9) geologic faulting -> faulting (geologic) (13) faulting (geologic) (13) faults (44) normal faults -> faults (44) reverse faults -> faults (44) strike-slip faults -> faults (44) thrust faults -> faults (44) transform faults -> fault zones (4) transverse faults -> faults (44) fault zones (4) fauna -> animals (5) fluvial features -> hydrographic features (18) geological features -> physiographic features (401) glacier features (1) hydrographic features (18) manmade features (181) marine features -> hydrographic features (18) ocean floor features -> seafloor features (1) physiographic features (401) seafloor features (1) subsea features -> seafloor features (1) tectonic features (45) thermal features (1) transportation features (1) underwater features -> seafloor features (1) volcanic features (5) forks (physiographic features) -> streams (7) fens -> wetlands (1) fermentation -> oxidation and reduction (1) ferries -> transportation features (1) geomagnetic field -> magnetic field (earth) (203) gravity field -> gravitational field (earth) (124) magnetic field -> magnetic field (earth) (203) gravitational field (earth) (124) magnetic field (earth) (203) field experiments (7) field inventory and monitoring (228) field methods (285) field monitoring -> field inventory and monitoring (228) field monitoring stations (1) field observation -> field inventory and monitoring (228) boulder fields -> physiographic features (401) coal fields -> mineral deposit areas (338) gas fields -> oil fields (1) ice fields -> ice masses (1) oil fields (1) petroleum fields -> oil fields (1) storage fields (petroleum) -> oil fields (1) field sampling (59) hand-held field spectroscopy -> handheld field spectroscopy (2) handheld field spectroscopy (2) field stations -> field monitoring stations (1) firehouses -> buildings (9) fire stations -> buildings (9) fish (3) fishes -> fish (3) fish ponds -> lakes (4) fishponds -> lakes (4) fission-track dating (7) fission-track method -> fission-track dating (7) fissures -> physiographic features (401) mud flats -> wetlands (1) tidal flats -> wetlands (1) flight lines -> navigational data (4) survey flight lines -> navigational data (4) flood stage -> streamflow (2) sea floor characteristics -> sea-floor characteristics (1) ocean floor features -> seafloor features (1) sea floor topography -> bathymetry (1) density flow -> sediment transport (1) ground-water flow -> groundwater flow (11) groundwater flow (11) stream flow -> streamflow (2) turbidity flow -> sediment transport (1) materials flow (commodities) (5) heat flow (earth) (2) flow diagramming -> conceptual modeling (1) groundwater flow modeling -> groundwater flow (11) debris flows -> landslides (1) earth flows -> landslides (1) lava flows -> volcanic activity (4) pyroclastic flows -> volcanic activity (4) x-ray fluorescence (61) fluorine (74) fluvial features -> hydrographic features (18) fluvial processes -> streamflow (2) coal fly ash -> coal ash (3) geologic folding -> folding (geologic) (2) folding (geologic) (2) folds (geologic) (5) foliation (geologic) (2) food chain -> food web (1) food cycle -> food web (1) food web (1) foothills -> mountains (1) study footprints -> study areas (8) fords (crossings) -> transportation features (1) volcanic eruption forecasting -> volcanic eruption prediction (1) forested wetlands -> wetlands (1) forest reserves -> reserves (1) national forests -> parks (2) state forests -> parks (2) forest stations -> buildings (9) forges -> industrial sites (9) forks (physiographic features) -> streams (7) ore formation (23) sinkhole formation (1) geologic formations -> bedrock geologic units (147) bed forms -> bedforms (1) fossil fuels -> energy resources (19) fossils (5) index fossils -> fossils (5) foundaries -> industrial sites (9) fracking -> hydraulic fracturing (1) fractal geometric methods -> mathematical modeling (55) fracture (geologic) (13) hydraulic fracturing (1) free-air anomaly (27) free trade zones -> administrative areas (1) freshwater (ground) -> groundwater (26) freshwater (surface) -> surface water (non-marine) (8) fuel depots -> transportation features (1) fossil fuels -> energy resources (19) fumaroles -> thermal features (1) biogeochemical functioning -> biogeochemical cycling (3) blast furnaces -> industrial sites (9) furnaces (industrial) -> industrial sites (9) furrows -> physiographic features (401)