- gauge cock
- gauged restriction
- Gault stage
- gear drive
- gear thrust
- gel cement
- gelate
- generalized section
- gentisic
- geode structure
- geodesic instrument
- geographic pole
- geologic position
- geological clock
- geomagnetic
- geophone group
- geostatic pressure
- geothermal method
- germanium
- gesso
- getter
- ghost reflexion
- geoddepression
- geographical survey
- geologic column
- geologic hammer
- geologic province
- geological horizon
- geometric isomer
- get strength
- giant molecule
- gibbsite
- Gilliland correlation
- gilsonite
- girder
- glacial action
- glacial groove
- glaciated valley
- glacier fall
- gladkaite
- gland ring
- glare
- glass cullet
- glass cutting
- glassed steel
- glassware
- glassy
- Glauber salt
- glauconitic limestone
- glaucophane
- globular structure
- glomeration
- glow conduction
- glowing cloud
- glucagon
- glucin
- gelling ability
- general chemistry
- geobios
- geochemical
- geological event
- geothermometer
- german silver
- giam
- giant powder
- gilbertite
- gillespite
- gin pole
- giobertite
- girt
- gismondite
- Givetian stage
- glacial burst
- glacial epoch
- glacial lake
- glacial outburst
- glacier lake
- glance coal
- gland oil
- glasphalt
- glass-ceramic
- Girbotal process
- glacial advance
- glacial basin
- glacial horn
- glacial moraine
- glacial period
- glacial ploughing
- glacial till
- glacier cave
- glacieret
- glade
- glance pitch
- glass coat
- glass cutter
- glass foam
- glass hardness
- glass rod
- glass wool
- glassine paper