a'a
ablation
accretionary lapilli
active fault
aeolian structure
agate
agglomerate
alabaster
albite
alkali flats
alluvial fan
alluvium
amber
amethyst
amphibole
andalusite
andesite
anglesite
anhydrite
anorthite
anorthosite
anthracite
anticline
antlerite
apatite
aquifer
aragonite
arète
arkose
arsenopyrite
asbestos
ash
asteroid
asthenosphere
astrobleme
augite
azurite

badlands
banded iron formation
barite
Barringer crater
basalt
batholith
bauxite
beach
bed
Benioff zone
benitoite
bentonite
bergschrund
beryl
biominerals
biotite
bituminous sands
black smoker
Blue John
bluff
borax
bornite
breccia
brucite
Burgess shale
butte

calcite
caldera
Cambrian period
Canadian shield
canyon
carbonate
carbonation
Carboniferous period
carnelian
carnotite
cassiterite
cat's eye
cave
celestine
Cenozoic era
cerussite
chalcanthite
chalcedony
chalcocite
chalcopyrite
chalk
Chandler wobble
chaotic terrain
chert
chiastolite
chlorite
chromite
Chryse Planitia
chrysoberyl
chrysotile
cinder cone
cinnabar
cirque
clastic rock
clay
cleavage
cliff
coal
coastlines
col
columbite
combe
conchoid fracture
concretion
conglomerate
constructive margin
continent
continental drift
continental shelf
contour
cordierite
cordillera
core
corundum
covellite
crater
crater chain
creep
Cretaceous period
crevasse
crossbedding
cross-cutting
crust
cryolite
cryovolcanism
cryptovolcano
crystal
crystallography
cuprite

dacite
dark halo crater
datolite
debris avalanche
denudation
deposition
destructive margin
Devonian period
diagenesis
differentiation
dike
diorite
displacement
dolerite
dolomite
drift
drumlin
Dry Valleys
dumortierite
dunite

Earth
Earth composition and internal structure
Earth impact craters
earthquake
East Pacific Rise
eclogite
Ediacaran period
effusive eruption
ejecta
ejecta blanket
elements, terrestrial abundance
emerald
enstatite
Eocene period
epidote
era
erosion
escarpment
esker
evaporite
exfoliation
extrusive

facies
fall line
fault
feldspar
fissure
flint
fluorite
fold
foliation
fossil
fumarole

gabbro
galena
garnet
garnierite
gemstone
geochronology
geode
geodesy
geological map
geology
geology
geophysics
geosyncline
geyser
ghost crater
Giant's Causeway
gilsonite
glacial drift
glacial groove
glacier
glauconite
gneiss
goethite
Gondwanaland
gorge
graben
granite
gravel
gravimetric analysis
Great Rift Valley
grit
gritstone
groundwater and water table
Gusev crater
guyot
gypsum

halite
hematite
hemimorphite
Holmes, Arthur (1890–1965)
Holocene epoch
hornblende
hornfels
hornito
horst
hot spot
hot spring
hummock
Hutton, James (1726–1797)
hydraulic action
hydrology
hypersthene

ice ages
Iceland spar
ice-sheet
idocrase
igneous age
igneous rock
ilmenite
impact basin
impact crater
impact melt
inlier
inselberg
intrusive
ironstone
Isidis Planitia
island
island arc
isostasy
isthmus

jade
jasper
joint
jökulhlaup
Jurassic period

kaolinite
kame
karst
kernite
kettle hole
kieselguhr
kimberlite
kipuka
kyanite

labradorite
lahar
land bridge
lapilli
lapis lazuli
laterite
Laurasia
lava
lava delta
lava flow
lava fountain
lava lake
lava tube
leaching
leucite
levée
lignite
limonite
limu
lithosphere
littoral cone
load
loess
longshore drift
Lyell, Charles (1797–1875)

maar
maghemite
magma
magnesite
magnetite
malachite
manganese nodules
manganite
Maniitsoq impact crater
mantle
marble
marcasite
maria
marl
matrix
meerschaum
Meridiani Planum
mesa
Mesozoic era
metamorphic rock
meteorite
mica
microcline
mid-ocean ridge
migmatite
Milankovich cycles
Milne, John (1850–1913)
mineral
mineral spring
mineralogy
Miocene Epoch
Mohoroviic discontinuity
Mohs scale
molybdenite
monadnock
monazite
montmorillonite
moonstone
moraine
Morokweng crater
mountains and mountain-building
mud volcano
mudstone
multiringed basin
muscovite

natrolite
névé
niccolite
nivation
norite
nuee ardente

obsidian
ocean basin
ocean trench
ocean waves
oceanography
ocher
oil sands
Oligocene epoch
olivine
Olympus Mons
onyx
oolith
oozes
opal
ore
Ordovician period
orpiment
orthoclase
orthopyroxene

pahoehoe
paleobotany
Paleocene
paleoclimatology
paleomagnetism
Paleozoic era
palimpsest
Pangea
pegmatite
Pele's hair
Pele's tears
peneplain
pentlandite
peridot
peridotite
permafrost
Permian period
Phanerozoic
phenacite
phlogopite
phreatic eruption
phyllite
piedmont
pillow lava
pingo
pit crater
pitchblende
placer deposits
plagioclase
plain
planetary features
plate tectonics
playa
Pleistocene period
plinean eruption
Pliocene epoch
pluton
polar wandering
porosity
porphyry
Precambrian
pressure ridges
prospecting
Proterozoic
pumice
pyrite
pyroclastic
pyrolusite
pyroxene
pyrrhotite

quartz
quartzite
Quaternary period
quicksand

raised beach
realgar
reducing atmosphere
regolith
relief
reticulite
rhyolite
Richter scale
rift valley
rift zone
rille
ring, planetary
river
rock
rock cycle
ruby
rudaceous
rutile

salina
salt dome
salt flat
sand
sandstone
sapphire
scapolite
scheelite
schist
scoria
seafloor and seafloor spreading
seamount
sediment
sedimentary rock
sedimentation
Sedgwick, Adam (1785–1873)
seismic wave
seismology
séracs
serpentine
shale
shatter cone
shield
shield volcano
sial
siderite
silica
silicates
sill
sillimanite
silt
Silurian period
sima
sink hole
slate
Smith, William "Strata" (1769–1839)
smithsonite
Snowball Earth soapstone
sodalite
soil erosion
solfatara
spatter
spatter and cinder cone
spatter rampart
sphalerite
spilite
spinel
spit
spodumene
spring
stack
stalactites and stalagmites
staurolite
Steno, Nicolaus (1638–1686)
stibnite
stishovite
stratigraphic column
stratigraphy
stratovolcano
stratum
stromatolite
Strombolian eruption
strontianite
Sudbury crater
subduction

taconite
talc
talus
tectonic
tectonic plate
tektite
tephra
terracing
tidal heating
till
topaz
tourmaline
travertine
Triassic period
troctolite
troilite
tuff
turbidites
turquoise

unconformity
uniformitarianism
U-shaped valley
Utopia Planitia

valley
vent
volcanic ash
volcanic block
volcanic bomb
volcanic dome
volcanic gas
volcanism
volcano
vulcanian eruption

water cycle
watershed
Wegener, Alfred Lothar (1880–1930)
wolframite
wurtzite

young surface

zeolite
zircon