- M-domain
- M-type Granite
- M.Y.
- maar
- macaluba
- maceral
- mackerel sky
- Macky effect
- macroclimate
- macrofacies
- macrometeorology
- macropore
- maculose
- maelstrom
- Maestrichtian
- maestro
- Mafic
- Magma
- Magma Chamber
- magma geothermal system
- magma province
- magmatic flow
- magmatic stoping
- Magmatic Water
- magmosphere
- magnafacies
- Magnesite
- magnetic annual change
- magnetic annual variation
- Magnetic Anomaly
- magnetic bay
- magnetic character figure
- magnetic daily variation
- Magnetic Declination
- magnetic dip
- magnetic direction
- magnetic diurnal variation
- magnetic element
- magnetic equator
- Magnetic Inclination
- magnetic latitude
- magnetic local anomaly
- magnetic meridian
- Magnetic North
- magnetic observatory
- magnetic pole
- magnetic prime vertical
- magnetic profile
- Magnetic Reversal
- magnetic secular change
- magnetic station
- magnetic storm
- Magnetic Stratigraphy
- magnetic survey
- magnetic variation
- magnetic wind direction
- Magnetite
- magnetoionic theory
- magnetoionic wave component
- magnetoionicduct
- Magnetometer
- magnetopause
- magnetosheath
- magnetosphere
- magnetospheric plasma
- magnetospheric ring current
- magnetospheric substorm
- magnetostratigraphy
- magnetotail
- magnetotellurics
- Magnitude
- main fault vein
- main joint
- main stream
- main stroke
- main thermocline
- mainland
- major fold
- major joint
- major trough
- Malachite
- Malacolite
- malenclave
- malloseismic
- Malm
- mamelon
- mammillary structure
- mandatory layer
- mandatory level
- mandatory surface
- Manganese nodule
- Manganite
- Mantle
- Mantle Plume
- mantle rock
- mantled gneiss dome
- mantled porphyroclast
- manto
- map plotting
- map spotting
- map vertical
- Marble
- Marcasite
- march
- mare's tail
- marekanite
- Margarite
- Margarodite
- margin
- marginal escarpment
- marginal fissure
- marginal moraine
- marginal plain
- marginal plateau
- marginal salt pan
- marginal sea
- marginal thrust
- marginal upthrust
- Margules equation
- marigram
- marine
- marine abrasion
- marine arch
- marine bridge
- marine cave
- marine climate
- marine forecast
- marine geology
- marine meteorology
- marine salina
- marine snow
- marine stack
- marine swamp
- marine terrace
- marine transgression
- marine weather observation
- marine-cut terrace
- Marinesian
- maritime air
- maritime climate
- maritime polar air
- maritime tropical air
- marker bed
- marl
- marly
- Marmatite
- Marmolite
- Marmor
- Marsden chart
- marsh gas
- Martite
- Mascagnin
- mascaret
- mascon
- mass attraction vertical
- mass erosion
- mass heaving
- mass movement
- mass wasting
- Mass Wasting (also Mass Movement)
- massif
- Massive
- master joint
- master stream
- Matanuska wind
- matched terrace
- material line
- material unit
- mathematical climate
- mathematical forecasting
- mathematical geography
- mathematical geology
- matinal
- matric forces
- matrix
- matrix porosity
- matrix rock
- matrix velocity
- mature
- mature soil
- matureland
- maturity
- maturity index
- max-wind and shear chart
- max-wind level
- max-wind topography
- maximum flood
- maximum subsidence
- maximum sustainable yield
- maximum zonal westerlies
- maximum-wind and shear chart
- maximum-wind level
- maximum-wind topography
- maximumebb
- Mcf
- Meager
- mean chart
- mean depth
- mean diurnal high-water inequality
- mean diurnal low-water inequality
- mean high water
- mean high-water lunitidal interval
- mean high-water neaps
- mean high-water springs
- mean higher high water
- mean latitude
- mean low water
- mean low-water lunitidal interval
- mean low-water neaps
- mean low-water springs
- mean lower low water
- mean lower low-water springs
- mean map
- mean neap range
- mean neap rise
- mean range
- mean rise interval
- mean rise of tide
- mean river level
- mean sea level
- mean spring range
- mean spring rise
- mean stress
- mean temperature
- mean tide
- mean tide level
- mean water level
- meander
- meander bar
- meander belt
- meander core
- meander niche
- meander plain
- meander scar
- meander spur
- Meandering Stream
- mechanical erosion
- mechanical instability
- mechanical sediment
- mechanical turbulence
- Mechanical Weathering
- Medial Moraine
- median line/surface
- median mass
- median particle diameter
- Medical Geology
- mediterranean
- Mediterranean climate
- Mediterranean Sea
- medium-range forecast
- medium-volatile bituminous coal
- Meerschaum
- megacyclothem
- megaripple
- megatectonics
- Meionite
- Melaconite
- Melanesia
- melange
- melanic
- Melanite
- Melanochroite
- melanocratic
- Melanterite
- Melilite
- Mellite
- melting level
- meltwater
- member
- mendip
- Meramecian
- Mercalli scale
- mere
- Merian's formula
- meridian
- meridional
- meridional cell
- meridional flow
- meridional front
- meridional index
- meridional wind
- meromictic
- Mersey yellow coal
- merzlota
- mesa
- mesa plain
- mesa-butte
- mesobenthos
- mesoclimate
- mesoclimatology
- mesocyclone
- mesogeosyncline
- mesohaline
- Mesole
- Mesolite
- mesometeorology
- mesopause
- mesopeak
- mesoscale eddies
- mesoscale motion
- mesosiderite
- mesosphere
- mesostasis
- mesothermal climate
- mesotil
- Mesozoic
- metaanthracite
- metabentonite
- Metacinnabarite
- metahalloysite
- metaharmosis
- metalimnion
- metallogenic province
- metallographic province
- metamorphic aureole
- metamorphic cycle
- metamorphic event
- metamorphic overprint
- Metamorphic Rock
- metamorphic rock reservoir
- metamorphic zone
- Metamorphism
- metaripple
- metasediment
- Meteor
- meteor trail
- meteoric stone
- Meteoric Water
- Meteorite
- meteorite crater
- meteorogram
- Meteoroid
- meteorolite
- meteorological
- meteorological chart
- meteorological data
- meteorological equator
- meteorological minima
- meteorological radar
- meteorological range
- meteorological solenoid
- meteorological tide
- metharmosis
- Miargyrite
- Mica
- mica-fish or mica fish
- micaceous
- microbarm
- microbarograph
- microbreccia
- microburst
- microclimate
- microclimatology
- Microcrystalline
- microearthquake
- microfault induced microcracks
- microfaults
- microgauge
- microgeography
- microlayer
- Microline
- microlithon
- micrometeorology
- micropore
- micropulsation
- microquake
- microrelief
- microscale motion
- microscopic feather fractures (mff)
- Microseism
- microtektite
- microthermal climate
- microvitrain
- mid-Atlantic ridge
- mid-extreme tide
- mid-latitude
- mid-latitude westerlies
- mid-ocean canyon
- mid-ocean ridge
- mid-ocean rift
- mid-ocean rise
- mid-oceanic ridge
- Middle Cambrian
- middle clouds
- Middle Cretaceous
- Middle Devonian
- Middle Jurassic
- Middle Mississippian
- Middle Ordovician
- Middle Permian
- Middle Silurian
- Middle Triassic
- middle-latitude westerlies
- MiddlePennsylvanian
- midfan
- migma
- migration
- migratory
- migratory dune
- Milankovitch cycles
- milky weather
- Millerite
- Milling
- Milling Capacity
- millipede structure
- Mima mound
- mimetic growth
- Mimetite
- Mindel glaciation
- Mindel-Riss interglacial
- Mineral
- mineral caoutchouc
- mineral charcoal
- mineral deposit
- mineral fish
- Mineral Interest
- Mineral Lease
- mineral lineation
- mineral resources
- mineral soil
- mineral spring
- Mineral Structure
- mineral water
- mineral wax
- mineralization
- mineralize
- mineralizer
- mineralogenetic epoch
- mineralogenetic province
- Mineralogy
- minimum ebb
- minimum flood
- minor trough
- minuano
- minus-cement porosity
- Miocene
- miogeocline
- miogeosyncline
- mire
- misfit stream
- Mispickel
- Mississippian
- Missourian
- mist
- mist droplet
- mistral
- mixed cloud
- mixed current
- mixed layer
- mixed nucleus
- mixed ore
- mixed tide
- mixing ratio
- mixolimnion
- MMBO
- MMcf
- moat
- mobile belt
- mobilization
- Mocha Stone
- mock fog
- mode 1 fracture
- mode 2 fracture
- mode 3 fracture
- mode eddies
- model atmosphere
- moder
- moderate breeze
- moderate gale
- modified index of refraction
- modified refractive index
- mofette
- Mohawkian
- Mohnian
- Moho
- Mohole drilling
- Mohorovicic Discontinuity
- Mohs
- Mohs Hardness Scale
- moist adiabat
- moist air
- moist climate
- moist-adiabatic lapse rate
- moisture
- moisture adjustment
- moisture factor
- moisture film cohesion
- moisture inversion
- molasse
- mold
- moldauite
- moldavite
- molecular fossils
- Mollisol
- Molybdates
- Molybdenite
- monadnock
- Monazite
- monimolimnion
- Monocline
- Monoclinic
- monocrystalline ribbon
- monogeosyncline
- monsoon
- monsoon climate
- monsoon current
- monsoon fog
- monsoon low
- Montian
- moon pillar
- Moonstone
- moor coal
- mor
- morainal apron
- morainal delta
- morainal lake
- morainal plain
- Moraine
- moraine bar
- moraine kame
- moraine plateau
- morphogenetic region
- morphographic map
- mortar structure
- mortlake
- morvan
- mother lode
- mother rock
- mother-of-coal
- mother-of-pearl clouds
- mottled
- motu
- moulin
- moulin pothole
- mound
- Mountain
- mountain and valley winds
- mountain breeze
- mountain brown ore
- mountain chain
- mountain climate
- mountain glacier
- Mountain Green
- mountain mahogany
- mountain meteorology
- mountain pediment
- mountain range
- mountain slope
- mountain system
- mountain wave
- mountain wind
- mountain wood
- mountain-gap wind
- mouth
- Mozambique Current
- muck
- Mud
- mud ball
- mud cone
- mud crack
- mud crack polygon
- mud flat
- mud polygon
- mud pot
- mud volcano
- Mudflow
- mudlump
- mudslide
- Mudstone
- muggy
- mull
- Muller's Glass
- mullion
- multicycle
- Multiple Completion Well
- multiple discharge
- multiple fault
- multiple reflection
- multiple tropopause
- multiple-current hypothesis
- Muschelkalk
- Muscovite
- mustard-seed coal
- Mylonite
- myloniticfoliation
- mylonitization
- myrmekite
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