Alphabetical listing of categories: H

H5N1 -> avian influenza (7) habitat alteration (12) habitat destruction -> habitat alteration (12) habitat fragmentation -> habitat alteration (12) habitats (2) habitats (29) city halls -> buildings (12) halls -> buildings (12) town halls -> buildings (12) halting places (transportation) -> transportation features (4) hamlets -> populated places (7) hammocks -> physiographic features (214) hand-held field spectroscopy -> handheld field spectroscopy (1) handheld field spectroscopy (1) hanging valleys -> valleys (3) harbors (4) harbours -> harbors (4) water hardness (3) hardness (water) -> water hardness (3) seismic hazard maps (14) -> maps and atlases WITH earthquake occurrences hazard mitigation -> hazard preparedness (60) hazard preparedness (60) earthquake hazards (45) -> earthquakes WITH hazards environmental hazards -> hazards (157) geologic hazards -> hazards (157) hazards (157) mining hazards (10) headlands -> capes (1) headquarters -> buildings (12) park headquarters -> buildings (12) headwaters -> drainage basins (56) human health -> environmental health (human) (26) environmental health (human) (26) health (human) -> environmental health (human) (26) health and disease (76) health facilities -> medical facilities (2) slag heaps -> disposal sites (2) heatflow (earth) -> heat flow (earth) (1) heat flow (earth) (1) heaths -> shrublands (2) gage height -> streamflow (148) herbicide contamination -> pesticide and herbicide contamination (23) pesticide and herbicide contamination (23) herbivores (1) heredity -> genetics (6) herpetology (18) Hg -> mercury (7) high-pressure liquid chromatography -> liquid chromatography (1) Advanced Very High Resolution Radiometer (AVHRR) -> AVHRR (11) highway maintenance sites -> transportation features (4) highways -> roadways (2) hiking -> recreation (4) hills -> mountains (6) climate history -> climate change (68) earth history (5) geologic history (41) life history -> population and community ecology (371) strain history -> deformation (geologic) (10) Ho -> holmium (5) holes (seafloor) -> seafloor features (15) hollows -> valleys (3) holmium (5) nursing homes -> medical facilities (2) homesteads -> populated places (7) horizontal datums -> map coordinate systems (3) liverworts and hornworts (1) horseshoe crabs (1) horticulture -> agriculture (13) hospitals -> medical facilities (2) hostels -> buildings (12) hotels -> buildings (12) hot springs -> thermal features (6) club houses -> buildings (12) community houses -> buildings (12) customs houses -> buildings (12) houses -> buildings (12) HPAI -> avian influenza (7) HPLC -> liquid chromatography (1) human disease -> environmental health (human) (26) human environmental safety (10) human health -> environmental health (human) (26) human impacts (100) hunting -> recreation (4) hunting reserves -> reserves (5) hurricanes (27) livestock husbandry -> agriculture (13) gas hydrate resources (8) methane hydrate resources -> gas hydrate resources (8) hydraulic engineering (9) hydraulic models -> hydraulic engineering (9) hydraulics -> hydraulic engineering (9) hydroacoustics -> acoustic doppler current profiling (2) hydrodynamics (3) hydroelectric power generation water use -> power generation water use (5) hydrogeology (37) hydrographic datasets (106) hydrographic features (260) hydrographic sections -> hydrogeology (37) hydrographic structures (33) hydrologic cycle -> water cycle (5) hydrologic maps (27) -> hydrology WITH maps and atlases hydrologic processes (234) hydrology (387) hydrophytes -> aquatic vegetation (3) hydrosphere -> water resources (371) hydrothermal processes (6) hyperspectral imaging (4) hyporheic zone processes -> groundwater and surface-water interaction (4) hypoxia -> oxygen content (water) (12)

Alphabetical index of categories: H