News Wires, White Papers, and Books
- Irrigation Systems, Ancient
- Islands, Capes, and Peninsulas
- Isomerism
- Isotopes: Applications in Natural Waters
- Iteroparity and Semelparity
- Julian, Percy
- K/T Boundary
- Karst Hydrology
- KC-135 Training Aircraft
- Kelsey, Frances Kathleen Oldham
- Kinematics and Dynamics
- Kingdoms of Life
- Korolev, Sergei
- L-5 Colonies
- Lake Formation
- Lake Health, Assessing
- Lake Management Issues
- Lakes and Ponds
- Lakes: Biological Processes
- Lakes: Chemical Processes