Alphabetical listing of categories: E

early warning systems -> hazard preparedness (66) earth characteristics (217) rare earth elements (5) earth history (5) earth material properties (8) earthquake activity maps (14) -> maps and atlases WITH earthquake occurrences earthquake epicenter maps (14) -> maps and atlases WITH earthquake occurrences earthquake features (2) earthquake forecasting -> earthquake probabilities (18) earthquake hazards (49) -> earthquakes WITH hazards earthquake monitoring -> seismic networking (16) earthquake occurrence maps (14) -> earthquake occurrences WITH maps and atlases earthquake occurrences (42) earthquake prediction -> earthquake probabilities (18) earthquake preparedness (23) earthquake probabilities (18) earthquakes (92) earthquake seismology (31) -> seismology WITH earthquake occurrences Earth Science Information Centers (ESICs) -> reference services (4) earth sciences (692) earth structure (6) earth tides (1) echinoderms (2) echo sounding -> sonar methods (27) ecoclines -> ecosystems (103) ecological competition (2) ecological models -> ecological processes (82) long-term ecological monitoring (14) ecological processes (82) ecological research sites (2) ecologic succession -> succession (biological) (1) community ecology (13) ecology (132) insular ecology -> island ecosystems (1) population and community ecology (206) radar ecology (2) -> doppler radar imaging WITH population and community ecology economic geology (149) business and economics (10) economics -> business and economics (10) ecoregions -> biogeographic regions (69) ecosystem diversity (3) ecosystem functions (15) estuarine ecosystem functions -> ecosystem functions (15) ecosystem management (26) ecosystem monitoring (65) ecosystem preservation -> ecosystem management (26) aquatic ecosystems (120) arboreal ecosystems -> forest ecosystems (23) benthic ecosystems (3) coastal ecosystems (38) coniferous forests ecosystems -> forest ecosystems (23) coral reef ecosystems -> reef ecosystems (23) deciduous forest ecosystems -> forest ecosystems (23) desert ecosystems (13) ecosystems (103) estuarine ecosystems (27) forest ecosystems (23) freshwater ecosystems (29) grassland ecosystems (16) island ecosystems (1) lake ecosystems -> freshwater ecosystems (29) littoral ecosystems -> coastal ecosystems (38) marine ecosystems (37) marsh ecosystems -> wetland ecosystems (34) marshland ecosystems -> wetland ecosystems (34) mixed forest ecosystems -> forest ecosystems (23) mixed grass ecosystems -> grassland ecosystems (16) plains ecosystems -> grassland ecosystems (16) planktonic ecosystems (2) -> aquatic ecosystems WITH plankton pond ecosystems -> freshwater ecosystems (29) prairie ecosystems -> grassland ecosystems (16) rangeland ecosystems -> terrestrial ecosystems (100) reef ecosystems (23) riparian ecosystems -> wetland ecosystems (34) river ecosystems (4) -> river systems WITH freshwater ecosystems scrubland ecosystems -> shrubland ecosystems (6) short grass ecosystems -> grassland ecosystems (16) shrubland ecosystems (6) spring ecosystems -> freshwater ecosystems (29) stream ecosystems -> freshwater ecosystems (29) taiga ecosystems -> forest ecosystems (23) tall grass ecosystems -> grassland ecosystems (16) terrestrial ecosystems (100) tundra ecosystems (3) wetland ecosystems (34) ecosystem services -> ecosystem functions (15) ecotones -> ecosystems (103) ecotoxicology (62) ectoprocta -> bryozoans and brachiopods (1) eddies -> hydrographic features (245) shelf edges (ocean) -> continental margins (11) educational services (15) greenhouse effect (2) climate change effects -> effects of climate change (33) climate effects -> effects of climate change (33) effects of climate change (33) effluent -> contamination and pollution (163) electrical resistivity logging (2) electric plants -> power generation sites (1) electromagnetic surveying (11) electron microscopy (3) scanning electron microscopy (2) electrophoresis (3) toxic trace element contamination (32) chemical element groups (6) chemical elements (47) elements (5) lanthanide series elements (1) rare earth elements (5) elevation and relief -> topography (61) elevation maps -> topographic maps (5) El Nino -> ocean-atmosphere interaction (7) embassy buildings -> buildings (11) embayments -> bays (14) embryology -> developmental biology (2) emergency management resources -> hazards (167) emergency response planning -> hazard preparedness (66) advanced spaceborne thermal emission and reflection radiometer -> multispectral imaging (25) inductively coupled plasma-atomic emission spectrometry -> atomic emission spectroscopy (4) atomic emission spectroscopy (4) employment and volunteer opportunities (12) endangered species (22) endemic species (2) endocrinology (3) population energetics -> population and community ecology (206) wind energy (5) energy resources (117) energy sources -> energy resources (117) genetically engineered organisms (1) hydraulic engineering (9) engineering geology (13) engineering geology maps (2) -> maps and atlases WITH engineering geology engineering sciences (25) engineering seismology (4) -> seismology WITH engineering sciences search engines -> search services (11) enhanced oil recovery (4) dependent political entities -> political areas (1) independent political entities -> political areas (1) political entities -> political areas (1) semi-independent political entities -> political areas (1) entomology (7) cave entrances -> caves (6) mine entrances -> mine sites (15) environmental analysis -> environmental assessment (46) environmental areas -> reserves (5) environmental assessment (46) environmental chemistry -> biochemistry (10) environmental hazards -> hazards (167) environmental health (human) (28) environmental impact assessment -> environmental assessment (46) environmental management -> natural resource management (232) environmental planning -> natural resource management (232) environmental processes -> ecological processes (82) human environmental safety (12) environmental toxicology -> ecotoxicology (62) eolian sediments -> unconsolidated deposits (20) EOR -> enhanced oil recovery (4) earthquake epicenter maps -> maps and atlases (220) Er -> erbium (5) erbium (5) beach erosion (28) -> erosion WITH coastal processes coastal erosion (28) -> coastal processes WITH erosion erosion (45) shoreline erosion (28) -> erosion WITH coastal processes eruption -> volcanic activity (67) volcanic eruption forecasting -> volcanic eruption prediction (6) volcanic eruption prediction (6) United States Government establishments -> buildings (11) age estimation methods (6) estuaries (18) estuarine ecosystem functions (1) -> ecosystem functions WITH estuarine ecosystems estuarine ecosystems (27) estuarine processes (2) estuarine sediment transport (1) -> sediment transport WITH estuarine processes Eu -> europium (5) europium (5) eutrophication (6) evaporation (4) salt evaporation ponds -> lakes (36) evapotranspiration (3) -> evaporation WITH transpiration evolution (1) exhibition buildings -> buildings (11) exotic species -> nonindigenous species (51) experimental areas -> research areas (3) experimental fields -> research areas (3) field experiments (9) experiment stations -> research facilities (4) exploration -> natural resource exploration (11) natural resource exploration (11) seismic exploration (1) -> seismic methods WITH natural resource exploration external research support (4) extinction and extirpation (3) extinction and extirpation (3) extirpation -> extinction and extirpation (3) natural resource extraction (31) resource extraction -> natural resource extraction (31)

Alphabetical index of categories: E