- a axis
- A frame
- A Horizon
- a-b plane
- a-c girdle
- A-Type Granite
- Aa
- aa channel
- aa lava
- Aalenian
- abandoned channel
- ABC system
- abioseston
- ablation
- ablation area
- ablation cone
- ablation factor
- ablation form
- ablation moraine
- abnormal anticlinorium
- abnormal fold
- abnormal magnetic variation
- abnormal synclinorium
- abrade
- Abraham's tree
- abrasion
- abrasion platform
- abrasive
- abrasive ground
- abs
- absolute
- absolute age
- absolute drought
- absolute geopotential topography
- absolute instability
- absolute isohypse
- absolute linear momentum
- absolute momentum
- absolute stability
- absolute time
- absorption
- abstraction
- abundance
- abyssal
- abyssal cave
- abyssal fan
- abyssal floor
- abyssal gap
- abyssal hill
- abyssal injection
- abyssal plain
- abyssal rock
- abyssal theory
- abyssal zone
- abyssal-benthic
- abyssolith
- abyssopelagic
- Ac
- Acadian Epoch
- Acadian orogeny
- Acanthodians
- accelerated erosion
- acceptable risk
- Accessory
- accessory cloud
- accessory ejecta
- accessory element
- accident
- accident block
- accidental ejecta
- acclivity
- Accommodation structures
- accordant
- accordant drainage
- accordant fold
- accordant summit level
- accretion
- accretion tectonics
- accretion topography
- accretion vein
- accretion zone
- accretionary lapilli
- accretionary lava ball
- Accretionary prism
- accretionary ridge
- accumulated temperature
- accumulation
- accumulation area
- accumulation zone
- achondrite
- acicular
- acicular ice
- Acid
- acid clay
- acid precipitation
- acid rain
- acid soil
- acidic lava
- Acidic Rock
- acidity coefficient
- acidulous water
- aclinal
- aclinic
- aclinic line
- Acoustic Logs
- Acquisition
- Acre-Foot
- acre-foot per day
- acre-ft/d
- acre-in
- acre-inch
- acre-yield
- Acreage
- acrobatholithic
- acromorph
- Acrotomous
- acrozone
- Actinolite
- active foliation
- active front
- active glacier
- active layer
- active margin
- active permafrost
- active volcano
- activity ratio
- actual age
- actual elevation
- actual pressure
- actual relative movement
- actualism
- acute angle block
- adakites
- adalert
- Adamantine
- Adamite
- ader wax
- adfreezing
- adiabat
- adiabatic atmosphere
- adiabatic chart
- adiabatic condensation pressure
- adiabatic condensation temperature
- adiabatic equilibrium
- adiabatic equivalent temperature
- adiabatic lapse rate
- adiabatic rate
- adiabatic saturation pressure
- adiabatic saturation temperature
- adinole
- adjacent sea
- adjusted elevation
- adjusted stream
- adjustment
- adlittoral
- admixture
- Adobe
- adobe flats
- adolescence
- adolescent coast
- adolescent river
- adolescent stream
- Adularia
- adularization
- advance
- advection
- advection fog
- advectional inversion
- advective hypothesis
- advective model
- advective thunderstorm
- adventive cone
- adventive crater
- Aegirite
- aeolian
- AERO code
- aerogeography
- aerogeology
- aerography
- aerolite
- aerological days
- aerological diagram
- aerology
- aeromagnetic surveying
- aeronautical climatology
- aeronautical meteorology
- aeronomy
- aeropause
- aerosiderite
- aerosol
- aerospace environment
- aerothermodynamic border
- affine deformation
- affine strain
- Africa
- African superplume
- afterglow
- aftershock
- Aftonian interglacial
- Agalmatolite
- Agaric Mineral
- Agassiz orogeny
- Agassiz trawl
- Agassiz Valleys
- Agate
- agatized wood
- age
- age determination
- age of diurnal inequality
- age of diurnal tide
- Age of Fishes
- Age of Mammals
- Age of Man
- age of parallax inequality
- age of phase inequality
- age of tide
- age ratio
- aged
- aged shore
- ageostrophic wind
- Agglomerate
- agglomeration
- agglutinate cone
- aggradation
- aggradation recrystallization
- aggraded valley floor
- aggraded valley plain
- aggregate
- aggregate lineation
- aggregate shape preferred orientation
- aggregate structure
- aggressive magma
- aggressive water
- agonic line
- agravic
- agricere
- agricultural geography
- agricultural geology
- Agulhas Current
- aiguille
- aimless drainage
- air composition
- air current
- air discharge
- air drainage
- air gap
- air heave
- air hoar
- air mass
- air parcel
- air pocket
- air shooting
- air sounding
- air temperature
- air turbulence
- air volcano
- air-earth conduction current
- air-earth current
- air-mass analysis
- air-mass climatology
- air-mass precipitation
- air-mass shower
- air-mass source region
- airborne control system
- airborne profile
- aircraft ceiling
- aircraft electrification
- aircraft icing
- aircraft report
- aircraft thermometry
- aircraft weather reconnaissance
- airglow
- airlight
- airshed
- airspace
- airwave
- airways code
- airways forecast
- airways observation
- Airy isostasy
- Aitken nuclei
- Ak
- aktological
- Alabama Period
- Alabaster
- Alaska Current
- albedo neutrons
- albedo particles
- Alberta low
- Albertite
- Albian
- albic horizon
- Albionian
- Albite
- Alboll
- alcove
- alcove lands
- alee basin
- aleishtite
- Aleutian Current
- Aleutian low
- Alexandrian
- Alfisol
- Algae
- algal
- algal biscuit
- algal coal
- algal mat
- algal pit
- algal reef
- algal ridge
- algal rim
- algal structure
- Algoman orogeny
- Algonkian
- Alkali
- alkali emission
- alkali flat
- alkali lake
- alkali metal
- alkali soil
- Alkaline rock
- alkaline soil
- alkenones
- Allanite
- Alleghenian
- Alleghenian orogeny
- Allemontite
- Allende meteorite
- Allerod oscillation
- allevardite
- allochem
- allochthon
- allochthonous coal
- allochthonous stream
- allogene
- allogenic
- Allomorph
- allophane
- allothigene
- allothimorph
- allothogene
- allothogenic
- alluvial
- alluvial cone
- alluvial dam
- alluvial deposit
- alluvial fan
- alluvial flat
- alluvial ore deposit
- alluvial plain
- alluvial slope
- alluvial terrace
- alluvial valley
- alluvialsoil
- alluviation
- alluvion
- Alluvium
- Almandine
- alongshore current
- alpenglow
- Alpides
- alpine
- alpine glacier
- Alpine orogeny
- alpinotype tectonics
- Alstonite
- Altaid orogeny
- Alteration
- altiplanation
- altiplanation surface
- altiplanation terrace
- Altithermal
- altithermal soil
- altocumulus cloud
- altostratus cloud
- alum coal
- Alum Schist
- Alumina
- aluminum ore
- Alunite
- alunitization
- Alunogen
- alyphite
- Amalgams
- Amazonite
- Amber
- ambient stress field
- Amblygonite
- amemolite
- Amethyst
- Amianthus
- amictic lake
- amino acid dating
- Ammanian
- Ammonite
- Amoeba
- amoeboid fabric
- amoeboid fold
- amoeboid glacier
- Amorphous
- amorphous frost
- amorphous peat
- amorphous sky
- amorphous snow
- Ampelite
- Amphibole
- Amphibolite
- amphidromic
- amphimorphic
- amphisapropel
- amphitheater
- amphoterite
- amygdaloid
- Amygdaloidal
- amygdaloidal lava
- amygdule
- anabatic wind
- anabranch
- anaclinal
- anacoustic zone
- anaerobic sediment
- anafront
- Analcime
- analcimization
- anallobaric center
- analog
- analysis
- analytical geomorphology
- anamigmatism
- anamorphic zone
- anamorphism
- anaseism
- anastatic water
- anastomosing
- Anatase
- anatexis
- anathermal
- anchieutectic
- anchor ice
- anchor station
- anchor stone
- anchored dune
- Andalusite
- Andean-type continental margin
- Andept
- Andes glow
- Andes lightning
- Andesine
- Andesite
- andesite line
- andesiticglass
- andrite
- anemoclast
- anemoclastic
- anemology
- anemometry
- Angara Shield
- angle of current
- angle of dip
- Angle of Repose
- angle of shear
- Anglesite
- Angoumian
- angrite
- anguclast
- angular spreading
- Angular Unconformity
- angular wave number
- angular-spreading factor
- anhedral crystal
- Anhydrite
- Animikean
- animikite
- Anisian
- anisotropic
- Ankerite
- annealing
- Annivite
- annual flood
- annual inequality
- annual layer
- annual magnetic change
- annual magnetic variation
- annual storage
- annual variation
- annular drainage pattern
- annular fluid inclusion
- anomalous magma
- anomaly
- anomaly of geopotential difference
- anorogenic
- anorogenic time
- Anorthite
- Anorthoclase
- anorthositization
- anoxic zone
- antarctic air
- antarctic anticyclone
- Antarctic Circle
- Antarctic Circumpolar Current
- Antarctic Convergence
- antarctic front
- Antarctic Intermediate Water
- Antarctic Ocean
- Antarctic ozone hole
- Antarctic vortex
- Antarctic Zone
- Antarctica
- antecedent platform
- antecedent precipitation index
- antecedent stream
- antecedent valley
- anteconsequent stream
- antediluvial
- anthodite
- Anthophyllite
- Anthracite
- anthracitization
- Anthraconite
- anthracoxene
- anthraxolite
- anthraxylon
- anthropogeography
- anti-perthite
- anticenter
- anticlinal
- anticlinal axis
- anticlinal bend
- Anticlinal line
- anticlinal mountain
- anticlinal theory
- anticlinal trap
- anticlinal valley
- anticline
- Anticlinorium
- anticyclogenesis
- anticyclolysis
- anticyclone
- anticyclonic
- anticyclonic shear
- anticyclonic winds
- antidip stream
- antidune
- antiestuarine circulation
- antiform
- Antilles Current
- Antimonite
- Antimony
- antiperthite
- antipodes
- antitaxial fringe
- antitaxial vein
- antithetic
- antitrades
- antitriptic wind
- antitwilight arch
- Antler orogeny
- anvil
- anvil cloud
- Ao horizon
- Aoo horizon
- Apatite
- Aperture
- apex
- Aphanite
- Aphanitic rock
- aphotic zone
- API-gravity
- Aplite
- apob
- apogean tidal currents
- apogean tides
- Apophyllite
- Appalachia
- Appalachian orogeny
- apparent cohesion
- apparent dip
- apparent movement of faults
- apparent plunge
- apparent precession
- apparent vertical
- apparent wander
- apparent water table
- apple coal
- Appleton layer
- applied climatology
- applied meteorology
- apposition beach
- apron
- Aptian
- aquagene tuff
- aqualf
- Aquamarine
- Aquent
- aqueous lava
- Aqueous Rock
- Aquept
- Aquiclude
- Aquifer
- Aquifer artesian
- Aquifer confined
- Aquifer unconfined
- aquifuge
- Aquitanian
- aquitard
- Aquod
- Aquoll
- Aquox
- Aquult
- Aragonite
- Arbuckle orogeny
- arc
- arc measurement
- arc of parallel
- Archaean
- Archean
- archeomagnetic dating
- Archeozoic
- archibenthic zone
- archibole
- arching
- archipelagic apron
- archipelago
- architectonic
- arctic air
- arctic anticyclone
- Arctic Circle
- arctic climate
- arctic desert
- arctic front
- arctic haze
- arctic high
- arctic mist
- Arctic Ocean
- Arctic Oscillation
- arctic sea smoke
- Arctic Zone
- arcuate delta
- arcuation
- arcus
- ARDC model atmosphere
- Ardennian orogeny
- area forecast
- areal eruption
- areal geology
- arenaceous
- arenarious
- arenicolite
- Arenigian
- Arenite
- Arent
- arete
- ARFOR
- ARFOT
- Arfvedsonite
- Argentine
- Argentite
- Argid
- Argillaceous
- argillation
- argillic alteration
- argilliferous
- Argillite
- Argovian
- arid climate
- arid erosion
- arid zone
- Aridisol
- aridity
- aridity coefficient
- aridity index
- Arikareean
- Arkose
- arm
- ARMET
- armored mud ball
- Armorican orogeny
- arrested decay
- arris
- arrival time
- Arroyo
- Arsenates
- Arsenic
- Arsenopyrite
- arteritic migmatite
- artesian aquifer
- artesian basin
- artesian leakage
- artesian spring
- artesian water
- artesian well
- artificial radiation belt
- Artinskian
- As
- asar
- Asbestos
- aschistic
- aseismic
- ash
- ash cone
- ash fall
- ash field
- ash flow
- ash fusibility
- ash plain
- ash rock
- ash shower
- ash viscosity
- Ashby
- Ashgillian
- ashygrit
- Asia
- asiderite
- Aso lava
- aspect
- aspect angle
- asperity
- asphalt rock
- asphalt stone
- asphaltic sand
- asphaltite
- aspite
- ASPO
- assemblage
- assimilation
- associated corpuscular emission
- Astartian
- asthenolith
- Asthenosphere
- Astian
- Astrobleme
- astrogeodetic
- astrogeodetic datum orientation
- astrogeodetic deflection
- astrogeodetic leveling
- astrogeodetic undulations
- astrogravimetric leveling
- astrogravimetric points
- astronomical azimuth
- astronomical equator
- astronomical latitude
- astronomical leveling
- astronomical longitude
- astronomical meridian
- astronomical meridian plane
- astronomical parallel
- astronomical position
- astronomical refraction
- astronomical station
- astronomical surveying
- astronomical tide
- Asturian orogeny
- asymmetrical bedding
- asymmetrical fold
- asymmetrical laccolith
- asymmetrical ripple mark
- asymmetrical vein
- asymptote of convergence
- asymptotic cone of acceptance
- asymptotic direction of arrival
- Atacamite
- ataxial vein
- ataxic
- ataxite
- atectonic
- atectonic pluton
- Atlantic Ocean
- Atlantic-type continental margin
- atmoclast
- atmogenic
- atmolith
- atmophile element
- atmosphere
- atmospheric absorption
- atmospheric attenuation
- atmospheric boundary layer
- atmospheric cell
- atmospheric chemistry
- atmospheric composition
- atmospheric condensation
- atmospheric density
- atmospheric diffusion
- atmospheric disturbance
- atmospheric duct
- atmospheric electric field
- atmospheric electricity
- atmospheric evaporation
- atmospheric gas
- atmospheric general circulation
- atmospheric interference
- atmospheric ionization
- atmospheric lapse rate
- atmospheric layer
- atmospheric physics
- atmospheric radiation
- atmospheric refraction
- atmospheric region
- atmospheric scattering
- atmospheric shell
- atmospheric sounding
- atmospheric structure
- atmospheric suspensoids
- atmospheric tide
- atmospheric turbulence
- atmospherics
- Atokan
- Atoll
- atoll structure
- atoll texture
- atomic number contrast image
- attached dune
- attached groundwater
- Atterberg scale
- Attican orogeny
- attitude
- attrital coal
- attrition
- attritus
- aubrite
- augen
- augen kohle
- Augite
- aulacogen
- aureole
- Aurichalcite
- auriferous
- aurora
- aurora australis
- aurora borealis
- aurora polaris
- auroral absorption event
- auroral caps
- auroral electrojet
- auroral forms
- auroral frequency
- auroral isochasm
- auroral oval
- auroral poles
- auroral region
- auroral storm
- auroral substorm
- auroral zone
- auroral zone blackout
- auster
- austral
- austral axis pole
- Australia
- australite
- Austrian orogeny
- authigenic
- authigenic sediment
- autobarotropy
- autobrecciation
- autochthon
- autochthonous
- autochthonous coal
- autochthonous sediment
- autochthonous stream
- Autoclastic
- autoclastic schist
- autoconsequent falls
- autoconsequent stream
- autoconvection
- autoconvection gradient
- autoconvective instability
- autoconvective lapse rate
- autogenetic drainage
- autogenetic topography
- autogeosyncline
- autoinjection
- autointrusion
- autolysis
- automatic weather station
- autonomous underwater vehicle
- autophytograph
- autopneumatolysis
- autumn ice
- Autunian
- Autunite
- AUV
- Auversian
- auxiliary fault
- auxiliary plane
- AVA diagram
- available moisture
- available relief
- avalanche
- avalanche wind
- aven
- Aventurine
- average limit of ice
- aviation weather forecast
- aviation weather observation
- AVO
- Avonian
- avulsion
- axial compression
- axial culmination
- axial dipole field
- axial planar foliation
- axial plane
- axial stream
- axial surface
- axial trace
- axial trough
- axial-plane cleavage
- axial-plane foliation
- axial-plane schistosity
- axial-plane separation
- Axinite
- axinitization
- axis
- Axstone
- azimuth
- azimuth equation
- Azoic
- Azoic Age
- azonal soil
- Azores high
- Azurite
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