Across
- 1. caused by human activities
- 4. changing factors
- 7. Predicting a situation
- 8. short form for dissolved oxygen
- 10. water that is stored in the soil
Down
- 2. Chalky condition of water source
- 3. negative human activity affecting water quality
- 5. PH value below 7
- 6. unit of measurement for dissolved oxygen
- 9. question frame