- P wave
- P-domain
- P-E ratio
- P-wave
- paar
- pachoidal structure
- Pacific anticyclone
- Pacific Equatorial Countercurrent
- Pacific high
- Pacific North Equatorial Current
- Pacific Ocean
- Pacific South Equatorial Current
- Pacific-type continental margin
- pack
- pack ice
- packing
- packing density
- packing proximity
- paesa
- paesano
- pagoda stone
- Pagodite
- paha
- Pahoehoe
- paint pot
- painted pot
- painter
- paired terrace
- Palaeocene
- palaeopiezometer
- palaeostress
- Palagonite
- palasite
- paleic surface
- paleobotanic province
- paleoceanography
- Paleocene
- paleochannel
- Paleoclimate
- paleoclimatic sequence
- paleoclimatology
- paleocrystic ice
- paleocurrent
- Paleocurrent Map
- paleoequator
- paleofluminology
- Paleogene
- paleogeographic event
- Paleogeographic Map
- paleogeographic stage
- paleogeography
- paleogeologic map
- paleogeology
- paleogeomorphology
- paleohydrology
- paleoisotherm
- paleokarst
- paleolatitude
- paleolimnology
- paleolithologic map
- paleomagnetic stratigraphy
- paleomagnetics
- Paleomagnetism
- paleometeoritics
- Paleontology
- paleopedology
- paleophysiography
- paleoplain
- paleopole
- paleosalinity
- paleoslope
- paleosol
- paleosome
- paleostructure
- paleotectonic map
- paleotemperature
- paleothermal
- paleothermometry
- paleotopography
- Paleozoic
- palette
- palevent
- palimpsest
- palingenetic
- palinspastic map
- Palisade disturbance
- palisades
- pallasite
- pallasite shell
- palouser
- palstage
- pampero
- pan
- pan coefficient
- pan ice
- Panabase
- panas oetara
- panautomorphic rock
- pancake
- pancake ice
- panfan
- Pangaea
- Pangea
- panidiomorphic rock
- Pannonian
- pannus
- panplain
- panplanation
- panplane
- Panthalassa
- papagayo
- paper shale
- paper spar
- parabituminous coal
- parabolic dune
- parachronology
- paraclinal
- paraconformity
- paraconglomerate
- paraffin coal
- paraffin dirt
- parageosyncline
- paraglomerate
- paragneiss
- paraliageosyncline
- paralic
- paralic coal basin
- paralic swamp
- paralimnion
- parallax age
- parallax inequality
- parallel
- parallel drainage pattern
- parallel fold
- parallel ripple mark
- parallel roads
- parallochthon
- parametric hydrology
- parametric latitude
- pararipple
- parasitic cone
- parastratigraphic unit
- parastratigraphy
- parastratotype
- paratill
- parautochthonous
- parcel method
- Parent Element
- parent material
- parent rock
- parental magma
- parogenetic
- paroxysmal eruption
- partial obscuration
- partial pediment
- partial pluton
- partial potential temperature
- partial thermoremanent magnetization
- partial tide
- partial-duration series
- particle diameter
- particle size
- particle size distribution (PSD)
- particle velocity
- particle-size analysis
- parting
- parting cast
- parting lineation
- parting plane lineation
- parting-step lineation
- partitioning
- partiversal
- partly cloudy
- parvafacies
- pass
- passage
- passage bed
- passive fold
- passive foliation
- passive front
- passive glacier
- passive inclusion
- passive margin
- passive permafrost
- patch reef
- paternoster lake
- patina
- patterned ground
- paulopost
- pavement
- PCA
- PDB
- pea coal
- pea gravel
- pea-soup fog
- peak
- Peak Flow
- peak gust
- peak plain
- pearlite
- pearlstone
- Pearly
- Peat
- peat bed
- peat bog
- peat breccia
- peat coal
- peat formation
- peat moor
- peat slime
- peat soil
- peat-sapropel
- pebble
- pebble bed
- pebble coal
- pebble dike
- pebble peat
- pebble phosphate
- pebblearmor
- pebblestone
- pebbly mudstone
- pebbly sand
- pebbly sandstone
- Pectolite
- ped
- pedalfer
- pedality
- pedestal
- pedestal boulder
- pedestal rock
- Pediment
- pediment gap
- pediment pass
- pedimentation
- pediocratic
- pediplain
- pediplanation
- pediplane
- pedocal
- pedogenesis
- pedogenics
- pedogeochemical survey
- pedogeography
- pedography
- pedolith
- pedologic age
- pedologic unit
- pedology
- pedon
- pedorelic
- pedosphere
- pedotubule
- PeeDee belemnite
- peel thrust
- peesweep storm
- peg model
- Pegmatite
- pegmatitic stage
- pegmatitization
- pelagic
- pelagic limestone
- Pelagic Sediment
- pelagochthonous
- pelagosite
- Pele's hair
- Pele's tears
- Pelean cloud
- pelelith
- pelite
- pelitic
- pell-mell structure
- pellet
- pellicular water
- pellodite
- pelmicrite
- pelodite
- pelogloea
- pelphyte
- pelyte
- pencil cleavage
- pencil gneiss
- pencil ore
- pendant
- pendant cloud
- pendent terrace
- pendular water
- penecontemporaneous
- peneplain
- peneplanation
- penetration funnel
- penetrative
- penetrative fabric element
- peninsula
- penitent
- penitent ice
- penitent snow
- pennant
- Penninite
- Pennsylvanian
- Penokean
- pentad
- Pentlandite
- Penutian
- peperite
- perbituminous
- perched aquifer
- perched block
- perched boulder
- perched groundwater
- perched lake
- perched rock
- perched spring
- perched stream
- perched water
- Perched Water Table
- perching bed
- percolation
- percolation zone
- percussion mark
- pereletok
- perennial lake
- perennial spring
- perennial stream
- perezone
- perfect prognostic
- perfemic rock
- perforated crust
- perforation deposit
- pergelation
- pergelic
- pergelisol table
- perhumid climate
- perhydrous coal
- periblinite
- periclinal
- pericline
- pericline ripple mark
- Peridotite
- peridotite shell
- perigean range
- perigean tidal currents
- perigean tide
- perigenic
- periglacial
- periglacial climate
- perimagmatic
- period
- periodic current
- periodic spring
- peripediment
- peripheral depression
- peripheral faults
- peripheral sink
- peripheral stream
- Perlite
- Perlitic Structure
- perlucidus
- permafrost
- permafrost island
- permafrost line
- permafrost table
- permanent aurora
- permanent current
- permanent extinction
- permanent ice foot
- permanent thermocline
- permanent water
- Permeability
- permeability trap
- permeable bed
- Permian
- permineralization
- Permo-Carboniferous
- perpendicular slip
- perpendicular slope
- perpendicular throw
- perpetual frost climate
- Perret phase
- perry
- persalic rock
- persistence
- persistence forecast
- Perthite
- perthitic
- Peru Current
- perviousness
- Petalite
- petrifaction
- petrified wood
- Petrochemicals
- petrochemistry
- petrofacies
- petrographer
- petrographic facies
- petrographic period
- petrographic province
- petrography
- Petroleum
- petroleum geology
- petroleum seep
- petroleum trap
- petroliferous
- petrologen
- petrologist
- petrology
- petromict
- petromorph
- petrophysics
- petrotectonics
- pezograph
- pH
- phacolith
- Phanerozoic
- phantom
- phantom bottom
- phantom horizon
- phase age
- phase inequality
- phase lag
- Phenakite
- Phenocryst
- phenology
- phi grade scale
- Phillipsite
- Phlogopite
- Phonolite
- phonon
- phorogenesis
- Phosphates
- phosphatic nodule
- phosphatization
- Phosphorite
- phosphorization
- phosphorus-nitrogen ratio
- photochemical smog
- photoclinometry
- photogeologic anomaly
- photogeologic map
- photogeology
- photogeomorphology
- phreatic
- phreatic cycle
- phreatic gas
- phreatic surface
- phreatic water
- phreatic zone
- phreatic-water discharge
- Phreatomagmatic
- Phyllite
- phyllofacies
- phyllomorphic stage
- phyllonite
- physical climate
- physical climatology
- physical exfoliation
- physical forecasting
- physical geography
- physical geology
- physical meteorology
- physical oceanography
- physical residue
- physical stratigraphy
- physical time
- Physical Weathering
- physiographic diagram
- physiographic feature
- physiographic form
- physiographic province
- phyteral
- phytoclimatology
- phytocollite
- Piacention
- pibal
- Picrite
- piecemeal stoping
- piedmont
- piedmont alluvial plain
- piedmont angle
- piedmont bench
- piedmont benchland
- piedmont bulb
- piedmont flat
- piedmont glacier
- piedmont gravel
- piedmont ice
- piedmont lake
- piedmont plain
- piedmont plateau
- piedmont scarp
- piedmont slope
- piedmont stairway
- piedmont step
- piedmont treppe
- piercement
- piercement dome
- piercing fold
- piezocrystallization
- piezogene
- piezoglypt
- piezometric surface
- PIGE
- pike
- pileus
- pillar
- pillow lava
- pillow structure
- pilmer
- pilot briefing
- pilot report
- pilot streamer
- pilot-balloon observation
- pilotaxitic
- pimple mound
- pimple plain
- pinch
- pinch-and-swell structure
- piner
- pingo
- pingo ice
- pingo remnant
- pinnacle
- pinnacled iceberg
- pinnate drainage
- pinning microstructure
- pinning of dislocations
- pipe
- pipe amygdule
- pipe clay
- pipe vesicle
- pipernoid texture
- piping
- pipkrake
- pirep
- pisolith
- pisolitictuff
- pit-run gravel
- pitch
- pitch coal
- pitching fold
- pitchstone
- pitted outwash plain
- pitted pebble
- pivotal fault
- PIXE
- pixel
- placanticline
- Placer
- Placer Deposit
- placic horizon
- Plaggept
- Plagioclase
- plain
- plain of denudation
- plain of lateral planation
- plain of marine denudation
- plain of marine erosion
- plain of submarine denudation
- plain tract
- plains-type fold
- Plaisancian
- Plaisanzian
- plaiting
- planar cross-bedding
- planar shape fabric
- planate
- planation
- planation stream piracy
- plane atmospheric wave
- plane bed
- plane jet
- plane of saturation
- plane strain
- planetary boundary layer
- planetary circulation
- planetary geology
- planetary geoscience
- planetary vorticity effect
- planetary wave
- planetary wind
- planform
- planoconformity
- Planosol
- plash
- plasma
- plasma mantle
- plasma sheet
- plasmapause
- plasmasphere
- plaster conglomerate
- plastic equilibrium
- plastic limit
- plastic zone
- plasticity index
- plasticlast
- plate
- plate crystal
- plate ice
- Plate Margins
- plate tectonics
- plateau
- Plateau Basalt
- plateau glacier
- plateau gravel
- plateau mountain
- plateau plain
- platelet
- platelet lineation
- platform
- platform beach
- platform facies
- platform reef
- platte
- platy
- platy quartz
- Playa
- playa lake
- Playfair's law
- Pleistocene
- plerotic water
- plexus
- plication
- Pliensbachian
- Plinian Eruption
- plinth
- plinthite
- Pliocene
- pliothermic
- plough wind
- plow sole
- plow wind
- plowshare
- plucking
- plug
- plug dome
- plug reef
- plum
- plumb line
- plume structure
- plumose structure
- plunge
- plunge basin
- plunge point
- plunge pool
- plunging breaker
- plunging cliff
- plunging fold
- plutology
- pluton
- plutonian
- plutonic
- plutonic breccia
- plutonic metamorphism
- Plutonic rock
- plutonic water
- plutonism
- pluvial
- pluvial lake
- pluviofluvial
- pluviometric coefficient
- pneumatogenic
- pneumatolysis
- pneumatolytic
- pneumatolytic stage
- pneumotectic
- pocket beach
- pocket valley
- pod
- Podzol
- podzolic soil
- podzolization
- pogonip
- poikiloblast
- poikiloblastic crystal
- poikilocrystallic
- poikilophitic
- poikilotope
- poikilotopic
- point
- point bar
- point defect
- point rainfall
- Point-Source Pollution
- points of the compass
- poised stream
- Poisson relation
- polacke
- polar air
- polar anticyclone
- polar automatic weather station
- polar circle
- polar climate
- polar continental air
- polar convergence
- polar cyclone
- polar desert
- polar easterlies
- polar electrojet
- polar firn
- polar front
- polar glacier
- polar high
- polar ice
- polar lake
- polar low
- polar maritime air
- polar meteorology
- polar migration
- polar outbreak
- polar regions
- polar trough
- polar variation
- polar vortex
- polar wandering
- polar westerlies
- polar-cap absorption
- polar-cap ice
- polar-easterlies index
- polar-front theory
- polarcap
- Polarity Epoch
- Polarity Event
- Polarity Reversal
- polarity zone
- polarization isocline
- pole of inaccessibility
- pole tide
- Polybasite
- polyclinal fold
- polygene
- polygenetic
- polygenic
- polygeosyncline
- polygonal arc
- polygonal fabric
- polygonal ground
- polygonal karst
- Polyhalite
- polymetamorphic diaphthoresis
- polymetamorphism
- polymictic
- polyn'ya
- polytropic atmosphere
- pond
- pondage
- pondage land
- ponded stream
- ponding
- ponente
- poniente
- Pontian
- pontic
- pool
- pool stage
- popple rock
- porcelain jasper
- porcelaneous
- pore
- pore compressibility
- pore fluid factor
- pore ice
- pore pressure
- pore space
- pore volume
- pore-size distribution
- pore-water pressure
- poriaz
- Porlezzina
- Porosity
- porosity trap
- porphyroblast
- porphyroclast
- porphyroclast aspect ratio method
- porphyrocrystallic
- porphyroskelic
- porphyrotope
- porphyrotopic
- port
- Porterfield
- Portlandian
- positive area
- positive axis
- positive element
- positive estuary
- positive landform
- positive movement
- positive shoreline
- Postglacial
- posthumous structure
- postmagmatic
- postobsequent stream
- postorogenic
- Potable Water
- potamology
- Potash
- potash bentonite
- potash kettle
- potash lake
- Potassium argon dating
- potassium bentonite
- potassium-argon dating
- potato stone
- potential evaporation
- potential evapotranspiration
- potential index of refraction
- potential instability
- potential refractive index
- potentiometric map
- potentiometric surface
- Pothole
- potrero
- Potstone
- Poulter seismic method
- powder avalanche
- powder snow
- power-law flow
- power-law profile
- pozzolan
- PPL
- PPM
- praecipitatio
- prairie
- prairie climate
- prairie soil
- Prase
- Pre-Cambrian
- pre-cold-frontal squall line
- prealpine facies
- Precambrian
- precipice
- precipitable water
- precipitable water vapor
- Precipitation
- precipitation area
- precipitation ceiling
- precipitation cell
- precipitation current
- precipitation echo
- precipitation effectiveness
- precipitation electricity
- precipitation excess
- precipitation facies
- precipitation intensity
- precipitation inversion
- precipitation physics
- precipitation station
- precipitation trails
- precipitation trajectory
- precipitation-evaporation ratio
- precipitation-generating element
- preconsolidation pressure
- predict
- prediction
- prefrontal squall line
- preglacial
- Prehnite
- preliminary waves
- preorogenic
- presque isle
- pressolved
- pressure altitude
- pressure center
- pressure contour
- pressure depth
- pressure field
- pressure force
- pressure fringe
- pressure gradient
- pressure ice
- pressure ice foot
- pressure jump
- pressure pan
- pressure pattern
- pressure penitente
- pressure plateau
- pressure release
- pressure ridge
- pressure shadow
- pressure solution
- pressure surface
- pressure system
- pressure tendency
- pressure topography
- pressure tube
- pressure wave
- pressure-altitude variation
- pressure-change chart
- pressure-fall center
- pressure-gradient force
- pressure-jump line
- pressure-release jointing
- pressure-rise center
- pressure-surface map
- pressure-tendency chart
- prester
- prestress
- presuppression
- prevailing current
- prevailing visibility
- prevailing westerlies
- prevailing wind
- prevailing wind direction
- previtrain
- Priabonian
- primary
- primary arc
- primary circle
- primary circulation
- primary clay
- primary crater
- primary cyclone
- primary dip
- primary flat joint
- primary foliation
- primary front
- primary geosyncline
- primary great circle
- primary low
- primary magma
- primary orogeny
- primary pollutant
- primary porosity
- Primary Recovery
- primary sedimentary structure
- Primary Seismic Waves
- primary stratification
- primary stratigraphic trap
- primary stress field
- primary structure
- primary wave
- prime meridian
- prime vertical circle
- priming of the tides
- primitive water
- principal strain
- principal strain axes
- principal strain values
- principal stress
- principal stress axes
- principal stress values
- principal stretches
- principal vertical circle
- principle of uniformity
- prism
- prism crack
- prismatic jointing
- prismatic structure
- private stream
- probability forecast
- probable maximum precipitation
- Procellarian
- process lapse rate
- process zone
- prod cast
- prod mark
- prodelta
- prodelta clay
- profile
- profile line
- profile of equilibrium
- profile section
- profiling snow gage
- proglacial
- prognostic chart
- prognostic equation
- progradation
- prograde metamorphism
- prograding shoreline
- progressive deformation
- progressive metamorphism
- progressive sand wave
- progressive sorting
- progressive wave
- prolapsed bedding
- proluvium
- promontory
- prong reef
- propaedeutic stratigraphy
- propagation forecasting
- Propylite
- Prospecting
- prostratigraphy
- protactinium-ionium age method
- protalus rampart
- Proterozoic
- Proto-Sun
- protointraclast
- protomylonite
- proton induced gamma-ray emission
- proton induced X-ray emission
- protostratigraphy
- Proustite
- Proven Reserves
- provenance
- province
- provincial series
- provitrain
- provitrinite
- proximal
- Psamment
- psammitic
- psephicity
- psephite
- psephyte
- pseudo cold front
- pseudo cross-bedding
- pseudo front
- pseudo ripple mark
- pseudo-oolith
- pseudoadiabat
- pseudoadiabatic chart
- pseudoadiabatic expansion
- pseudoallochem
- pseudocannel coal
- pseudochrysolite
- pseudocol
- pseudoconcretion
- pseudoconformity
- pseudoconglomerate
- pseudodiffusion
- pseudoequivalent temperature
- pseudofault
- pseudofibrous peat
- pseudogley
- pseudokarst
- pseudokettle
- pseudomicroseism
- Pseudomorph
- pseudomountain
- pseudonodule
- pseudostratification
- pseudotachylyte
- pseudotillite
- pseudounconformity
- pseudovitrinite
- pseudovitrinoid
- pseudovolcano
- Psilomelane
- psychrosphere
- pteropod ooze
- PTRM
- ptygma
- ptygmatic fold
- pudding ball
- puddingstone
- puelche
- puff cone
- puff of wind
- pull-apart
- Pumice
- pumice fall
- pumice stone
- pumiceous
- pumicite
- pumilith
- Purbeckian
- pure coal
- pure shear flow
- purga
- purl
- purple light
- Purpurite
- push moraine
- push-ridge moraine
- puy
- pycnocline
- Pyragyrite
- pyramidal iceberg
- Pyrenean orogeny
- Pyrite
- pyrite-type fringe
- pyritization
- pyritobitumen
- pyrobitumen
- Pyroclast
- Pyroclastic Flow
- pyroclastic ground surge
- Pyroclastic Rock
- pyrogenesis
- pyroheliometer
- Pyrolusite
- pyromagma
- Pyromorphite
- Pyrope
- Pyrophyllite
- pyrosphere
- pyroxene alkali syenite
- Pyroxene Granulite
- pyroxene monzonite
- pyroxene syenite
- Pyroxenes
- Pyrrhotite
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