G
- galactic cosmic ray (GCR)
- gale
- gale warning
- Galileo thermometer (Galilean thermometer)
- Galveston, Texas (see under The 1900 Storm)
- Galveston Hurricane of 1900 (in the US)
- gas balloon (see under Gas balloons today)
- gas flare (flare stack)
- (gas warfare: see) chemical warfare
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