Across
- 1. not a good measure of water quality
- 6. fertilizer runoff adds to water
- 8. lacking backbone
- 10. species to indicate environmental change
- 11. bug killer
- 12. amount of O2 in water
Down
- 2. pH less than 7
- 3. factor affecting DO
- 4. measure of water health
- 5. toxic in small quantities
- 6. measures quantities
- 7. mix acid and base
- 9. microbiological indicator
- 10. pH more than 7