Across
- 3. the process of increasing the salt content in soil
- 6. a disease caused by a pathogenic organism
- 7. the watering of land to make it ready for agriculture
Down
- 1. the practice of growing crops or raising animals
- 2. the introduction of harmful materials into the environment
- 4. outbreaks of previously unknown diseases
- 5. chemical compounds that are used to kill pests