Alphabetical listing of categories: H

H5N1 -> avian influenza (7) habitat alteration (13) habitat destruction -> habitat alteration (13) habitat fragmentation -> habitat alteration (13) habitats (2) habitats (30) city halls -> buildings (11) halls -> buildings (11) town halls -> buildings (11) halting places (transportation) -> transportation features (4) hamlets -> populated places (7) hammocks -> physiographic features (212) 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 (66) hazard preparedness (66) earthquake hazards (49) -> earthquakes WITH hazards environmental hazards -> hazards (167) geologic hazards -> hazards (167) hazards (167) mining hazards (10) headlands -> capes (1) headquarters -> buildings (11) park headquarters -> buildings (11) headwaters -> drainage basins (62) human health -> environmental health (human) (28) environmental health (human) (28) health (human) -> environmental health (human) (28) health and disease (53) 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 (157) herbicide contamination -> pesticide and herbicide contamination (24) pesticide and herbicide contamination (24) herbivores (1) heredity -> genetics (8) herpetology (19) Hg -> mercury (8) 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 (6) hills -> mountains (6) climate history -> climate change (69) earth history (5) geologic history (42) life history -> population and community ecology (206) strain history -> deformation (geologic) (7) 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 (14) hospitals -> medical facilities (2) hostels -> buildings (11) hotels -> buildings (11) hot springs -> thermal features (6) club houses -> buildings (11) community houses -> buildings (11) customs houses -> buildings (11) houses -> buildings (11) HPAI -> avian influenza (7) HPLC -> liquid chromatography (1) human disease -> environmental health (human) (28) human environmental safety (12) human health -> environmental health (human) (28) human impacts (103) hunting -> recreation (6) hunting reserves -> reserves (5) hurricanes (27) livestock husbandry -> agriculture (14) 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) hydroelectric power stations -> power generation sites (1) hydrogeology (38) hydrographic datasets (106) hydrographic features (245) hydrographic sections -> hydrogeology (38) hydrographic structures (35) hydrologic cycle -> water cycle (5) hydrologic maps (28) -> hydrology WITH maps and atlases hydrologic processes (233) hydrology (409) hydrophytes -> aquatic vegetation (3) hydrosphere -> water resources (260) hydrothermal processes (6) hyperspectral imaging (4) hyporheic zone processes -> groundwater and surface-water interaction (5) hypoxia -> oxygen content (water) (13)

Alphabetical index of categories: H