- Darcey, Henry Philibert Gaspard (1803-1858)
- Darwin, Charles Robert (1809-1882)
- Dating Methods
- Davis, William Morris (1850-1934)
- Debris Flow
- Deep Sea Exploration
- Delta
- Depositional Environments
- Desalination
- Desert and Desertification
- Devonian Period
- Dew Point
- Diamond
- Diatoms
- Dike
- Diurnal Cycles
- Divergent Plate Boundary
- Dolomite
- Douglas Sea Scale
- Douglass, Andrew Ellicott (1867-1962)
- Drainage Basins and Drainage Patterns
- Drainage Calculations and Engineering
- Drought
- Dune Fields
- Dunes
- Dust Storms
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