Across
- 3. Naturally occurring liquid or frozen H2O containing no salt
- 5. Describes salty water
- 9. Make something impure by exposure to a pollutant
- 10. A repeated process or cycle of improvement
- 11. Necessary for life
- 12. The introduction of harmful materials into the environment
Down
- 1. A body of porous rock or sediment saturated with groundwater
- 2. Useful tools for monitoring water resources
- 4. When mountains block rainfall needed for plant growth it has this effect
- 6. A chemical that repels or kills pests, such as insects
- 7. A device used to remove something unwanted from a liquid or gas
- 8. Synthetically cause rainfall by putting chemicals into the atmosphere