Alphabetical listing of categories: H

H5N1 -> avian influenza (4) habitat alteration (11) habitat destruction -> habitat alteration (11) habitat fragmentation -> habitat alteration (11) habitats (22) habitats (2) city halls -> buildings (4) halls -> buildings (4) town halls -> buildings (4) halting places (transportation) -> transportation features (4) hamlets -> populated places (8) hammocks -> physiographic features (87) hand-held field spectroscopy -> handheld field spectroscopy (1) handheld field spectroscopy (1) hanging valleys -> valleys (2) harbors (4) harbours -> harbors (4) water hardness (2) hardness (water) -> water hardness (2) seismic hazard maps (12) -> earthquake occurrences WITH maps and atlases hazard mitigation -> hazard preparedness (23) hazard preparedness (23) earthquake hazards (23) -> earthquakes WITH hazards environmental hazards -> hazards (96) geologic hazards -> hazards (96) hazards (96) mining hazards (10) headlands -> capes (1) headquarters -> buildings (4) park headquarters -> buildings (4) headwaters -> drainage basins (45) human health -> environmental health (human) (20) environmental health (human) (20) health (human) -> environmental health (human) (20) health and disease (59) slag heaps -> disposal sites (2) heaths -> shrublands (2) gage height -> streamflow (108) herbicide contamination -> pesticide and herbicide contamination (12) pesticide and herbicide contamination (12) herbivores (1) heredity -> genetics (4) herpetology (16) Hg -> mercury (3) high-pressure liquid chromatography -> liquid chromatography (1) Advanced Very High Resolution Radiometer (AVHRR) -> AVHRR (9) highway maintenance sites -> transportation features (4) highways -> roadways (2) hiking -> recreation (2) hills -> mountains (2) climate history -> climate change (16) earth history (3) geologic history (33) life history -> population and community ecology (291) strain history -> deformation (geologic) (9) holes (seafloor) -> seafloor features (10) hollows -> valleys (2) homesteads -> populated places (8) horizontal datums -> map coordinate systems (3) liverworts and hornworts (1) horseshoe crabs (1) horticulture -> agriculture (7) hostels -> buildings (4) hotels -> buildings (4) hot springs -> thermal features (4) club houses -> buildings (4) community houses -> buildings (4) customs houses -> buildings (4) houses -> buildings (4) HPAI -> avian influenza (4) HPLC -> liquid chromatography (1) human disease -> environmental health (human) (20) human environmental safety (9) human health -> environmental health (human) (20) human impacts (80) hunting -> recreation (2) hunting reserves -> reserves (2) hurricanes (15) livestock husbandry -> agriculture (7) gas hydrate resources (6) methane hydrate resources -> gas hydrate resources (6) hydraulic engineering (7) hydraulic models -> hydraulic engineering (7) hydraulics -> hydraulic engineering (7) hydroacoustics -> acoustic doppler current profiling (1) hydrodynamics (1) hydroelectric power generation water use -> power generation water use (3) hydrogeology (38) hydrographic features (165) hydrographic sections -> hydrogeology (38) hydrographic structures (15) hydrologic cycle -> water cycle (1) hydrologic maps (28) -> hydrology WITH maps and atlases hydrologic processes (161) hydrology (289) hydrophytes -> aquatic vegetation (1) hydrosphere -> water resources (320) hydrothermal processes (6) hyperspectral imaging (3) hyporheic zone processes -> ground-water and surface-water interaction (1) hypoxia -> oxygen content (water) (9)

Alphabetical index of categories: H