| Abbreviation | Definition |
|---|---|
| GA | Geographic Area |
| GAAB | Geology Associates Alumni Board |
| GACC | Geographic Area Coordination Center |
| GADS | Geographic Access Database System |
| GALVN | Galvanic |
| GARS | Geological Applications of Remote Sensing |
| GB | Green Bay |
| GBH | Great Blue Hill |
| GCAGS | Gulf Coast Association of Geological Societies |
| GCD | Geologic Column Diagram |
| GCE | General Common Elements |
| GCH | Green Color Histogram |
| GCMT | Global Centroid-Moment-Tensor |
| GCOS | Global Change Of Support |
| GD | Green Diamond |
| GDA | Geocentric Datum of Australia |
| GDE | Great Divide Expedition |
| GDEP | Geoscience Diversity Enhancement Program |
| GDP | Gentle Deep Pond |
| GDR | Geophysical Data Record |