- R wave
- rabal
- race
- radar climatology
- radar interferometry
- radar meteorological observation
- radar meteorology
- radar report
- radar storm detection
- radar storm-detection equation
- radar upper band
- radar weather observation
- radar wind
- Radial Drainage
- radial drainage pattern
- radial faults
- radiation budget
- radiation chart
- radiation fog
- radiational cooling
- radiational inversion
- radiative diffusivity
- radiative forcing
- radiatus
- radio climatology
- radio duct
- radio hole
- radio meteorology
- radio window
- radiochronology
- radioelectric meteorology
- radiogeology
- radioglaciology
- Radiolarian
- radiolarian chert
- radiolarian earth
- Radiolarian Ooze
- radiolarite
- radiometric age
- radiosonde observation
- Radstockian
- raffiche
- raft
- raft lake
- raft tectonics
- rafted ice
- rafting
- ragged ceiling
- raggiatura
- rain
- rain and snow mixed
- rain area report
- rain cloud
- rain crust
- rain factor
- rain gush
- rain gust
- rain pillar
- rain prints
- rain shadow
- rain stage
- raindrop
- raindrop impressions
- raindrop imprints
- rainfall
- rainfall frequency
- rainfall intensity
- rainfall inversion
- rainfall penetration
- rainfall regime
- rainforest climate
- raininess
- rainmaking
- rainsquall
- rainwash
- rainwater
- rainy climate
- rainy season
- raised beach
- rake
- ram
- rambla
- ramp
- ramp valley
- rampart
- rampart wall
- Rancholabrean
- randkluft
- random forecast
- range of tide
- range zone
- rank
- raob
- rapid
- rapid flow
- RAREP
- rate of sedimentation
- rate-of-change map
- Rating Curve
- ratio map
- rational formula
- ratioofrise
- rattle stone
- rattlesnake ore
- Rauracian
- ravelly ground
- ravine
- ravinement
- raw
- raw humus
- raw map
- rawin
- rawinsonde
- ray parameter
- Rayleigh atmosphere
- Rayleigh wave
- razor stone
- razorback
- re-entrant zone
- reach
- Reaction Series
- reaction softening
- Realgar
- rebat
- rebound
- reboyo
- Recent
- recess
- recession
- recession curve
- recessional moraine
- Recharge
- Recharge Area
- recharge well
- reclined fold
- recoil time-of-flight spectrometry
- reconstitution
- record observation
- recovery
- recrystallisation
- Recrystallization
- recrystallization flow
- rectangular cross ripple mark
- Rectangular Drainage
- rectangular drainage pattern
- rectification
- rectilinear shoreline
- rectorite
- Recumbent Fold
- recurrence interval
- recurrent folding
- recurvature
- recurved spit
- red clay
- red earth
- red loam
- red magnetism
- red mud
- Red Ochre
- red rock
- Red Sea
- red snow
- Red-Yellow Podzolic soil
- redbed
- Reddish-Brown Lateritic soil
- Reddish-Brown soil
- redeposition
- redoxomorphic stage
- Redrilled Well
- reduced latitude
- reduced pressure
- reduction
- reduction index
- reduction of tidal current
- reduction of tides
- reduction sphere
- reduzate
- reef
- reef cap
- reef cluster
- reef complex
- reef conglomerate
- reef core
- reef debris
- reef detritus
- reef edge
- reef flank
- reef flat
- reef front
- reef knoll
- reef milk
- reef patch
- reef pinnacle
- reef segment
- reef slope
- reef talus
- reef tufa
- reef wall
- reef-front terrace
- reentrant
- reference level
- reference locality
- reference section
- reference spheroid
- reference station
- reflected buried structure
- reflector
- refolding
- refoliation
- Refraction
- refraction coefficient
- refraction diagram
- refractive modulus
- Refugian
- reg
- regelation
- regenerated flow control
- regenerated glacier
- regime
- regimen
- region of escape
- regional dip
- regional forecast
- regional fractures
- regional geology
- Regional Metamorphism
- regional metasomatism
- regional slope
- regional slope deposit
- regional snowline
- regional unconformity
- regmagenesis
- regmaglypt
- Regolith
- Regosol
- regradation
- Regression
- regression conglomerate
- regressive overlap
- regressive reef
- regressive ripple
- regressive sediment
- regur
- Reichenbach's lamellae
- rejected recharge
- rejuvenate
- rejuvenated fault scarp
- rejuvenated stream
- rejuvenated water
- rejuvenation
- rejuvenation head
- relative age
- relative chronology
- relative contour
- relative current
- relative dating
- relative deflection
- relative divergence
- relative geologic time
- relative humidity
- relative hypsography
- relative isohypse
- relative permeability
- relative relief
- relative time
- relative topography
- relaxation
- release fracture
- release joint
- relic
- relict
- relict dike
- relict glacier
- relict lake
- relict permafrost
- relict sediment
- relict soil
- relict texture
- reliction
- Relief
- Relizean stage
- remanent magnetization
- remolded soil
- remolding index
- Remote Sensing
- remotely operated vehicle
- Rendoll
- Rendzina
- repeated reflection
- repetition
- Repettian
- repi
- Replacement
- replacement dike
- replacement texture
- replacement vein
- replenishment
- resedimentation
- resequent
- resequent fault-line scarp
- resequent stream
- Reservoir
- reservoir fluid
- reservoir fracture
- reservoir pressure
- reservoir rock
- reservoir zone
- reshabar
- residual
- residual anticline
- residual clay
- residual compaction
- residual dome
- residual kame
- residual liquid
- residual liquor
- residual map
- residual material
- residual mineral
- residual ochre
- residual sediment
- residual stress field
- residual swelling
- residual valley
- residue
- resinite
- Resinous
- resinous coal
- resinous luster
- resistate
- resistivity factor
- Resistivity Logs
- resonance trough
- resorbed reef
- rest hardening
- rest magma
- restricted
- restricted basin
- resultant wind
- resurgence
- resurgent
- resurgent cauldron
- resurrected
- retained water
- retardation
- reticulate
- reticulated bar
- Retrograde Metamorphism
- retrograde reservoir
- retrograde wave
- retrograding shoreline
- retrogression
- return
- return flow
- return streamer
- return stroke
- return water
- reversal of dip
- reverse cell
- Reverse Fault
- reverse saddle
- reverse similar fold
- reverse slip fault
- reverse slope
- reverse-flowage fold
- reversed
- reversed arc
- reversed consequent stream
- reversed polarity
- reversed stream
- reversed tide
- reversing current
- reversing dune
- revet-crag
- revived fault scarp
- revived folding
- revived stream
- revolution
- revolving storm
- rework
- Reynolds effect
- Reynolds model
- RH
- Rhaetian
- Rhaetic
- Rhaetic Beds
- rhegmagenesis
- rheid
- rheid fold
- rheidity
- rheoignimbrite
- rheology
- rhexistasy
- rhizic water
- rhizoconcretion
- rhizosphere
- Rhodanian orogeny
- Rhodochrosite
- Rhodocrosite
- Rhodonite
- rhombochasm
- rhomboid ripple mark
- rhourd
- Rhyolite
- rhyolitic glass
- rhyolitic lava
- rhyolitic tuff
- rhythmic accumulations
- rhythmic layering
- rhythmic sedimentation
- rhythmic stratification
- rhythmic succession
- rhythmite
- ria
- ria coast
- ria shoreline
- rib
- rib-and-furrow
- riband jasper
- ribbed moraine
- ribble
- ribbon
- ribbon bomb
- ribbon diagram
- ribbon jasper
- ribbon lightning
- ribbon mylonite
- ribbon reef
- ribbon structure
- ribbon vein
- ribut
- rice coal
- Richmondian
- Richter Magnitude Scale
- Richter scale
- rideau
- ridge
- Ridge (Mid-Ocean)
- ridge aloft
- ridge fault
- ridge-top trench
- ridged ice
- ridging
- riebungsbreccia
- Riedel shears
- riegel
- riffle
- rift
- rift lake
- rift valley
- rift-block mountain
- rift-block valley
- rift-valley lake
- right side up
- right way up
- Right-Lateral Fault
- right-lateral slip fault
- right-slip fault
- rill
- rill erosion
- rill flow
- rill mark
- rill wash
- rillenstein
- rilling
- rillstone
- rillwork
- rim cement
- rim gypsum
- rim ridge
- rim syncline
- rima
- rime
- rime fog
- rimmed kettle
- rimmed solution pool
- rimming wall
- rimrock
- rimstone
- rincon
- ring complex
- ring current
- ring depression
- ring dike
- ring fault
- ring fissure
- ring fracture
- ring structure
- ring syncline
- ring-fracture intrusion
- ring-fracture stoping
- ringite
- rip
- rip channel
- Rip Current
- riparian water loss
- ripe
- ripple
- ripple bedding
- ripple biscuit
- ripple drift
- ripple index
- ripple lamina
- ripple load cast
- ripple mark
- Ripple Marks
- ripple scour
- ripple symmetry index
- ripple till
- rips
- rise
- rise of tide
- rise pit
- riser
- rising limb
- rising tide
- Riss
- Riss-Wurm
- river
- river bar
- river basin
- river bottom
- river breathing
- river drift
- river end
- river flat
- river forecast
- river ice
- river morphology
- river plain
- river run gravel
- river system
- river terrace
- river tide
- river water
- river-deposition coast
- riverbed
- riverwash
- riving
- rivulet
- road
- roadstead
- roaring forties
- roaring sand
- Robin Hood's wind
- rocdrumlin
- roche moutonn‚e
- rock analogues
- rock asphalt
- rock awash
- rock bar
- rock bench
- rock cave
- rock control
- rock creep
- Rock Cycle
- rock desert
- rock drum
- rock drumlin
- rock failure
- rock fan
- Rock Flour
- Rock Glacier
- rock island
- rock magnetism
- rock matrix compressibility
- rock mechanics
- rock pediment
- rock pillar
- rock pool
- rock pressure
- rock river
- Rock Salt
- rock shelter
- rock slip
- rock stack
- rock step
- rock stream
- rock system
- rock terrace
- rock unit
- rock varnish
- rock wood
- rock-basin lake
- rock-bulk compressibility
- rock-defended terrace
- rock-floor robbing
- rock-glacier creep
- rock-stratigraphic unit
- rocket lightning
- rockfall
- rockforming
- rocking stone
- Rocks and Minerals
- Rockslide
- rod
- rofla
- ROFOR
- ROFOT
- rogenstein
- roggan
- roil
- roilywater
- roll
- roll cloud
- roll flattening
- roller
- rollers
- rolling beach
- Romanche trench
- ROMET
- rondada
- rongstockite
- roof
- roof foundering
- roof pendant
- roofed dike
- room
- rooster tail
- root
- root cast
- root clay
- root sheath
- root zone
- rootless vent
- ropak
- ropy lava
- rose diagram
- Ross Barrier
- Ross Sea
- Rossby wave
- Rossel Current
- rotary current
- rotary fault
- rotating models
- rotational bomb
- rotational fault
- rotational landslide
- rotational movement
- rotational wave
- rotenturm wind
- Rotliegende
- rotor cloud
- rotten ice
- rotten spot
- Rottenstone
- rougemontite
- rough ice
- roughness elements
- roughness length
- round wind
- roundness
- roundstone
- route component
- route forecast
- routivarite
- rouvillite
- ROV
- Rubasse
- rubber ice
- rubble
- rubble drift
- rubble ice
- rubble tract
- rubidium-strontium dating
- Ruby
- rudite
- Rudzki anomaly
- ruffle
- ruffled groove cast
- ruggedness number
- rule of V
- run
- run of the coast
- run-of-bank gravel
- run-up
- runnel
- running sand
- Runoff
- runoff coefficient
- runoff cycle
- runoff intensity
- runoff rate
- runout
- runway
- runway observation
- runway temperature
- runway visibility
- runway visual range
- Rupelian
- rupture
- Rupture Strength
- rupture zone
- rusting
- Rutile
- r‚seau
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