- RADAR and SONAR
- Radioactive Waste Storage (Geologic Considerations)
- Radioactivity
- Radon Production, Detection, and Elimination
- Rainbow
- Rapids and Waterfalls
- Rate Factors in Geologic Processes
- Ray, John (1627-1705)
- Red Tide
- Regolith
- Relativity Theory
- Relief
- Remote Sensing
- Revolution and Rotation
- Rhyolite
- Richardson, Lewis Fry (1881-1953)
- Richter Scale
- Richter, Charles F. (1900-1985)
- Ride, Sally (1951- )
- Rifting and Rift Valleys
- Rip Current
- Ritter, Carl (1779-1859)
- Rivers
- Rock
- Rockfall
- Rowland, F. Sherwood (1927- )
- Runcorn, S.K. (1922-1995)
- Runoff
- Welcome, guest!
- Login
- Join eNotes
Dictionary Tip:
Lookup any word on eNotes with our dictionary. Highlight the word and press SHIFT + D for a definition, or SHIFT + T for a synonym.