| Abbreviation | Definition |
|---|---|
| CTD | Conductivity, Temperature, and Depth |
| CTR | Castle Rock, New York, Seismograph station |
| CU | Undrain Consolidation Triaxial Test |
| CVG | Cirque and Valley Glacier |
| CVMFE | Control-Volume Mixed Finite Element |
| CVSD | Continuous Variable Slope Delta |
| CW | Constant Width |
| CWA | Covered Warning Area |
| CWFZ | Coyote Warp Fault Zone |
| CWS | Community Water Supply |
| CYN | Canyon |
| CZ | Cubic Zirconia |
| CZE | Critical Zone Exploration |
| D | Diamond |
| DAC | diamond anvil cell |
| DAF | Dissolved Air Filtration |
| DAR | Daily Afternoon Randomness |
| DBPR | Dragon's Back Pressure Ridge |
| DC | Drill Collar |
| DCAS | Distributed Collaborative Adaptive Sensing |