Across
- 3. a chemical commonly found in fertilizer
- 7. the draining away of water from the land
- 8. a pH of exactly 7
- 9. the concentration of salt in a solution
- 10. caused by humans; especially pollution or environmental
- 12. an alkaline substance; has a pH greater than 7
Down
- 1. a natural part of a region's ecosystem
- 2. water held in the soil or in pores and crevices in rock.
- 4. not an original part of a region's ecosystem
- 5. introduced to a region and can cause harm to an ecosystem
- 6. the cloudiness or haziness of water
- 10. a substance with acid; has a pH lower than 7
- 11. the measure of acidity or alkalinity of a substance