Alphabetical listing of categories: P

P -> phosphorus (1) pagodas -> towers (1) paleobotany (2) paleoceanography (4) paleoclimate -> climate change (16) paleogeography (1) paleomagnetic analysis (3) invertebrate paleontology (1) paleontology (20) vertebrate paleontology (5) paleoseismology (3) paleotectonic maps (7) -> tectonic processes WITH maps and atlases paleozoology -> paleontology (20) palm groves -> woods (1) oil palm plantations -> agricultural sites (3) palm tree reserves -> reserves (2) palynology (4) pampas -> grasslands (10) panchromatic imaging (1) parasitism -> symbiosis (1) parasitology (3) parishes -> countries, 2nd order divisions (1) park gates -> parks (7) park headquarters -> buildings (4) parking lots -> parking sites (1) parking sites (1) marine parks -> parks (7) national parks -> parks (7) parks (7) provincial parks -> parks (7) state parks -> parks (7) urban parks -> parks (7) parkways -> roadways (2) particle-beam spectroscopy (1) particle-size analysis -> grain-size analysis (2) atmospheric deposition (chemical & particulate) (5) atmospheric deposition (chemical and particulate) -> atmospheric deposition (chemical & particulate) (5) pastoral sites -> agricultural sites (3) pastures -> agricultural sites (3) ice patches -> ice masses (7) pathobiology -> pathology (18) pathology (18) patrol posts -> buildings (4) pavilions -> buildings (4) PCBs -> industrial pollution (5) peat cutting areas -> wetlands (26) peatlands -> wetlands (26) pedogenesis -> soil formation (3) pedology (soils) -> soil sciences (4) peninsulas -> capes (1) pest control (1) pesticide and herbicide contamination (12) petroleum basins -> mineral deposit areas (5) petroleum resources (gas) -> natural gas resources (23) petroleum resources (oil) -> oil resources (20) petrology (2) water pH (4) pH (water) -> water pH (4) pharmaceutical contamination (2) phosphorus (1) phosphorus content -> nutrient content (water) (11) photogrammetry -> remote sensing (79) aerial photographs (19) -> aerial photography WITH image collections photographs (30) -> photography WITH image collections scientists-at-work photographs (2) -> scientific careers WITH image collections aerial photography (26) photography (39) satellite photography -> visible light imaging (1) underwater photography (1) aerial photos (19) -> aerial photography WITH image collections air photos (19) -> aerial photography WITH image collections phycology (3) phylogeny -> paleontology (20) physical oceanography -> ocean sciences (34) biological and physical processes (521) physiographic features (87) physiography -> land surface characteristics (31) physiological processes (9) anatomy and physiology (6) physiology -> anatomy and physiology (6) phytoplankton (1) picnic areas -> parks (7) piers (1) pine groves -> woods (1) pitches (physiographic) -> physiographic features (87) open pit mines -> mine sites (7) gravel pits -> mine sites (7) placer mines -> mine sites (7) placers -> mineral deposit areas (5) governed places -> administrative areas (9) populated places (8) religious populated places -> populated places (8) halting places (transportation) -> transportation features (4) coastal plains -> coastal zones (43) plains (1) plains ecosystems -> grassland ecosystems (13) planetariums -> buildings (4) planetary bodies (16) planetary sciences (14) planetology -> planetary sciences (14) plankton (3) planktonic ecosystems (3) -> aquatic ecosystems WITH plankton emergency response planning -> hazard preparedness (23) environmental planning -> natural resource management (162) plant and animal tagging (4) plant and animal testing (4) banana plantations -> agricultural sites (3) cotton plantations -> agricultural sites (3) oil palm plantations -> agricultural sites (3) plantations -> agricultural sites (3) rubber plantations -> agricultural sites (3) sisal plantations -> agricultural sites (3) sugar plantations -> agricultural sites (3) tea plantations -> agricultural sites (3) animal and plant census (3) plant distribution -> biogeography (65) distribution of plants -> biogeography (65) flowering plants (6) non-vascular plants -> nonvascular plants (7) nonvascular plants (7) treatment plants -> buildings (4) vascular plants (8) plants (organisms) (23) inductively coupled plasma-atomic emission spectrometry -> atomic emission spectroscopy (2) plateaus (1) plate tectonics -> tectonic processes (20) platforms (continental margins) -> continental margins (8) playgrounds -> parks (7) plazas -> buildings (4) plot sampling (2) Plutonic rocks (1) points (physiographic) -> capes (1) polar bears -> bears (4) polders -> physiographic features (87) police posts -> buildings (4) political areas (1) administrative and political boundaries (4) political boundaries -> administrative and political boundaries (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) pollen analysis -> faunal and floral census (microscopic) (1) pollination (2) pollinators (5) air pollution (6) -> contamination and pollution WITH atmospheric composition contamination and pollution (108) industrial pollution (5) nonpoint-source pollution (3) pollution -> contamination and pollution (108) soil pollution (1) -> soil resources WITH contamination and pollution water pollution (9) -> contamination and pollution WITH water resources polychlorinated biphenyls -> industrial pollution (5) polymerase chain reaction (1) pond ecosystems -> freshwater ecosystems (15) beaver ponds -> lakes (25) fish ponds -> lakes (25) intermittent ponds -> lakes (25) intermittent salt ponds -> lakes (25) ponds -> lakes (25) salt evaporation ponds -> lakes (25) salt ponds -> lakes (25) tailing ponds -> disposal sites (2) intermittent pools -> lakes (25) pools (water bodies) -> lakes (25) populated localities -> populated places (8) populated places (8) population and community ecology (291) population dynamics (10) population energetics -> population and community ecology (291) biological population management (44) wildlife population management (19) portages -> transportation features (4) ports -> harbors (4) global positioning measurement -> GPS measurement (9) border posts -> buildings (4) customs posts -> buildings (4) patrol posts -> buildings (4) police posts -> buildings (4) trading posts -> buildings (4) potable water -> drinking water use (3) potassium-argon analysis (1) potentiometric surface -> ground-water level (8) potholes -> physiographic features (87) animal pounds -> buildings (4) hydroelectric power generation water use -> power generation water use (3) power generation water use (3) thermoelectric power generation water use -> power generation water use (3) ppl -> populated places (8) prairie ecosystems -> grassland ecosystems (13) prairies -> grasslands (10) acid precipitation -> acid deposition (5) precipitation (atmospheric) (21) precipitation measurement (10) -> field inventory and monitoring WITH precipitation (atmospheric) predators -> carnivores (6) earthquake prediction -> earthquake probabilities (12) volcanic eruption prediction (4) prefectures -> administrative areas (9) earthquake preparedness (12) fire preparedness (3) -> fires WITH hazard preparedness flood preparedness (3) -> floods WITH hazard preparedness hazard preparedness (23) landslide preparedness (1) -> hazard preparedness WITH landslides ecosystem preservation -> ecosystem management (16) preserves -> reserves (2) fire prevention -> fire control (1) primitive areas -> reserves (2) earthquake probabilities (12) atmospheric and climatic processes (87) bioenergetic processes -> biological and physical processes (521) biogeochemical processes -> biogeochemical cycling (9) biological and physical processes (521) ecological processes (85) environmental processes -> ecological processes (85) fluvial processes -> streamflow (108) geochemical processes (9) geologic processes (236) hydrologic processes (161) hydrothermal processes (6) hyporheic zone processes -> ground-water and surface-water interaction (1) ocean processes (16) physiological processes (9) tectonic processes (20) degradation products (chemical) -> pesticide and herbicide contamination (12) acoustic doppler current profiler -> acoustic doppler current profiling (1) seismic profiles -> seismic methods (37) acoustic doppler current profiling (1) map projections -> map coordinate systems (3) promontories -> capes (1) atmosphere properties -> atmospheric properties (11) atmospheric properties (11) earth material properties (4) water properties (39) water properties (marine) -> marine chemistry (1) prospecting -> natural resource exploration (9) protected areas -> reserves (2) protectorates -> administrative areas (9) protists (1) protozoans -> protists (1) provincial parks -> parks (7) proving grounds -> research facilities (2) public buildings -> buildings (4) public use areas -> parks (7) public water supply -> domestic water use (4) pueblos -> populated places (8) pyroclastic -> volcanic rocks (4) pyroclastic flows -> volcanic activity (48)

Alphabetical index of categories: P